What Size Backpack Is Best for Traveling the World?

Planning a trip and wondering what size backpack is best for traveling? SIXT.VN understands the importance of finding the perfect backpack for your adventures in Vietnam and beyond. This guide helps you determine the ideal backpack size, ensuring a comfortable and stress-free travel experience. We offer a range of services, from airport transfers to hotel bookings, making your journey seamless and enjoyable. Let SIXT.VN be your companion for an unforgettable trip, providing essential travel tips and reliable support.

1. Understanding Backpack Sizing for Travel

Backpack capacity is typically measured in liters, a standard unit that helps compare backpack sizes across different brands. A helpful rule of thumb is that 25-30 liter backpacks are suitable for short weekend trips, while 30-45 liter backpacks are better for longer journeys or extended travel. However, the ideal capacity depends on several factors, as highlighted by various travel experts.

To visualize the capacity, remember that a gallon jug holds about 3.7 liters. Therefore, a 20-liter backpack can hold approximately 5.5 gallon jugs. A medium-sized rolled-up t-shirt occupies about one liter of space, meaning you can fit around 20 rolled t-shirts in a 20-liter backpack.

It’s crucial to note that backpack capacity doesn’t always directly correlate with dimensions. Capacity indicates how much you can fit, while dimensions provide a clearer idea of what you can fit. For instance, some 15-liter daypacks might not accommodate a 13-inch laptop, whereas others, like expandable Knack Packs, can. Therefore, consider both the volume and dimensions when choosing a travel backpack.

Knack Pack travel backpack sizes comparison chart

2. How to Choose the Right Backpack Size for Your Travels

Selecting the right backpack size depends on your trip’s destination, duration, and purpose. Always consider these questions when shopping for a travel backpack.

2.1. Consider Your Trip Length

A weekend trip requires fewer clothes and items compared to a multi-week journey. For longer trips, you’ll need more clothes and toiletries, necessitating a larger bag. Conversely, for shorter trips, avoid carrying an unnecessarily large backpack with empty space.

As Neo F. notes, “The Series 2 Medium Knack Bag has enough space to hold 3-4 days of clothing and the laptop pocket is awesome. It is highly functional and exactly what I was looking for.”

2.2. Review Where You Are Traveling

If you’re traveling to a warm, sunny location, you can likely use a smaller bag since lighter clothes take up less space. However, bulkier clothes for colder climates require a larger backpack. Similarly, business trips necessitate room for professional attire and technology. Consider any extras like cameras, toiletries, or wool socks. Even on shorter trips, you may need a larger bag to fit everything.

Traveling with an expandable Knack Pack

2.3. Determine Your Packing Style

Some travelers are minimalist packers, while others prefer to bring backups for everything. Be realistic about your packing style. If you’re a just-in-case packer, a larger travel backpack is advisable. Creating a packing list can help you optimize your packing, regardless of your style.

Travel backpack

3. What Is the Best Carry-On Travel Backpack Size?

The ideal carry-on backpack size is generally under 50 liters or approximately 22 x 14 x 9 inches. Opt for a 45-liter backpack if you want to maximize your carry-on capacity. Most airlines adhere to these dimensions, but it’s always wise to check their specific guidelines. A smaller backpack that fits under the seat in front of you, typically under 20 x 12 x 9 inches, can be considered a personal item.

4. Travel Backpacks vs. Outdoor Backpacks

Outdoor backpacks, often used for hiking, typically start at 45 liters and are not ideal for general travel. Organizing clothes, tech, and toiletries in their deep, top-loading compartments can be challenging. These backpacks make accessing your items difficult and their dangling straps can get caught. A general-purpose travel backpack offers more pockets for organization and presents a more professional appearance for city travel and hotel stays.

Raul A. shares, “I have taken my Knack Pack on over 20 trips. I arrive at the hotel, empty everything in a drawer, compress the bag, and it’s the perfect computer bag. Caught in a downpour and everything stayed dry inside. Expanded, it fits perfectly under the seat on every flight.”

5. Should I Consider an Expandable Backpack for Travel?

An expandable backpack offers the flexibility of extra space when needed and serves multiple purposes, making it an excellent choice for travel.

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5.1. What Is The Best Expandable Backpack Size for Overnight Trips?

A 20-30 liter backpack is perfect for overnight trips. The Small Knack Pack, at 15 liters unexpanded, is ideal for carrying essentials during the day, with an expandable compartment for a day’s worth of clothing.

5.2. What Is The Best Expandable Backpack Size for Trips of a Couple of Nights?

The Medium Knack Pack, with 27 liters unexpanded and 39 liters expanded, can hold at least 2-3 days of clothes. It also features a separate laptop pocket that fits a 15-inch laptop, making it perfect for short trips requiring online work.

5.3. Is A 40L Backpack Big Enough for Traveling?

Yes, a 40-liter backpack is generally sufficient for traveling, provided you avoid overpacking. Overpacking can be as problematic as under-packing, and you want to avoid carrying a heavy bag everywhere.

5.4. What Is The Best Expandable Backpack Size for Long Trips?

The Large Knack Pack offers 30 liters unexpanded, making it a great daypack. When expanded to 46 liters, it can accommodate a significant amount of clothing and travel essentials for longer trips.

Jon C. notes about his Series 1 Large Expandable Knack Pack, “I was able to make it through 3 weeks in Europe with this bag (and packing cubes) as well as use it for my work.”

The advantage of an expandable backpack is its dual functionality as a daypack, eliminating the need to pack a separate daypack.

6. Travel Backpack Size Guide

7. Factors Influencing Your Backpack Choice

Several factors should influence your choice of backpack size, ensuring it aligns with your specific travel needs.

7.1. Trip Duration and Destination

• Short Trips (1-3 days): A smaller backpack, around 20-30 liters, is sufficient for a quick getaway.
• Mid-Length Trips (3-7 days): A medium-sized backpack, between 30-45 liters, offers enough space for clothing and essentials.
• Long Trips (7+ days): A larger backpack, 45-60+ liters, is necessary for extended travel.
• Warm Climates: Lightweight clothing allows for smaller backpacks.
• Cold Climates: Bulky clothing requires larger backpacks.

7.2. Airline Carry-On Restrictions

Understanding airline carry-on restrictions is vital to avoid extra fees and ensure a smooth travel experience.

• Size Limits: Most airlines limit carry-on bags to around 22 x 14 x 9 inches (56 x 36 x 23 cm).
• Weight Limits: Weight limits vary by airline, typically ranging from 15-22 pounds (7-10 kg).
• Personal Item: A smaller bag or backpack that fits under the seat is usually allowed as a personal item.

It’s always best to check with your specific airline for their exact carry-on policies to prevent any surprises at the airport.

7.3. Personal Comfort and Fit

Choosing a backpack that fits comfortably is crucial for avoiding strain and discomfort during your travels.

• Torso Length: Measure your torso length to determine the appropriate backpack size. Most backpacks come in sizes S, M, and L, corresponding to different torso lengths.
• Adjustable Straps: Look for backpacks with adjustable shoulder, chest, and waist straps to customize the fit.
• Padded Straps: Padded shoulder straps and hip belts can significantly improve comfort, especially when carrying heavy loads.
• Weight Distribution: A good backpack distributes weight evenly across your back and hips, reducing strain on your shoulders.

7.4. Intended Activities

Consider your planned activities when selecting a backpack.

• Hiking: Choose a backpack with features like hydration compatibility, external attachment points for trekking poles, and durable, weather-resistant materials.
• City Exploration: Opt for a backpack with anti-theft features, comfortable shoulder straps, and easy access to compartments.
• Business Travel: Select a backpack with a dedicated laptop compartment, organizational pockets, and a professional appearance.

7.5. Packing Style and Habits

Your packing style significantly influences the backpack size you need.

• Minimalist Packer: If you pack light, a smaller backpack (20-30 liters) should suffice.
• Just-In-Case Packer: If you tend to overpack, a larger backpack (45+ liters) is necessary.

Regardless of your packing style, consider using packing cubes to compress your clothes and keep your belongings organized.

8. How To Accurately Measure Backpack Capacity

While liters are the standard unit for backpack capacity, understanding how this translates to real-world usage can be challenging. Here’s how to accurately gauge backpack capacity.

8.1. Understand Liter Measurements

One liter is equivalent to 1,000 cubic centimeters. Backpack manufacturers calculate capacity by measuring the internal volume of the main compartment and all pockets.

8.2. Visualizing Capacity

Think of a liter as roughly the size of a quart container. A 30-liter backpack, for example, can hold approximately 30 quart-sized items.

8.3. Packing Tests

Before committing to a backpack, try packing it with items you typically bring on your trips. This will give you a better sense of whether the capacity meets your needs.

8.4. Read Reviews

Check online reviews to see what other travelers say about the backpack’s capacity. Pay attention to comments about whether the backpack runs small or large for its stated liter size.

9. Expert Packing Tips to Maximize Space

Effective packing can significantly increase the amount you can carry in your backpack.

9.1. Rolling vs. Folding Clothes

Rolling clothes saves more space and reduces wrinkles compared to folding.

9.2. Use Packing Cubes

Packing cubes compress clothes, keep items organized, and prevent shifting during travel.

9.3. Wear Bulky Items

Wear your heaviest shoes, jackets, and sweaters to free up space in your backpack.

9.4. Minimize Shoes

Shoes take up a lot of space. Limit yourself to two or three pairs and stuff socks inside them to maximize space.

9.5. Travel-Sized Toiletries

Use travel-sized toiletries to save space and comply with airline regulations.

10. Maintaining Your Backpack

Proper maintenance extends the lifespan of your backpack and ensures it remains in good condition for future travels.

10.1. Regular Cleaning

Wipe down your backpack regularly with a damp cloth to remove dirt and stains. For deeper cleaning, hand wash with mild soap and water.

10.2. Avoid Overloading

Overloading your backpack can strain the seams and zippers. Stick to the recommended weight limit.

10.3. Store Properly

Store your backpack in a cool, dry place away from direct sunlight. This prevents the fabric from fading and deteriorating.

10.4. Check Zippers

Periodically check the zippers and lubricate them with zipper lubricant or wax to keep them functioning smoothly.

10.5. Repair Tears

Repair any tears or holes immediately to prevent them from getting larger. Use a patch kit or take your backpack to a professional for repairs.

11. How SIXT.VN Can Help You Plan Your Vietnam Trip

Planning a trip to Vietnam can be overwhelming, but SIXT.VN offers a range of services to make your journey seamless and enjoyable.

11.1. Travel Consultation Services

SIXT.VN provides personalized travel consultation services to help you plan your itinerary. Our experts offer advice on the best destinations, activities, and accommodations based on your preferences and budget.

11.2. Airport Transfer Services

Enjoy a stress-free arrival with SIXT.VN’s airport transfer services. Our reliable drivers will pick you up from the airport and transport you to your hotel safely and comfortably.

11.3. Hotel Booking Services

SIXT.VN offers a wide range of hotel options to suit every budget and preference. Whether you’re looking for a luxury resort or a budget-friendly guesthouse, we can help you find the perfect accommodation.

11.4. Tour and Activity Bookings

Explore Vietnam’s cultural and natural attractions with SIXT.VN’s tour and activity bookings. We offer guided tours to popular destinations, as well as unique experiences like cooking classes, boat trips, and trekking adventures.

11.5. Flight Booking Services

SIXT.VN can assist you with booking flights to and from Vietnam. We search for the best deals and convenient flight schedules to make your travel planning easier.

12. Embrace Sustainable Travel Practices

Traveling responsibly is essential for preserving the environment and supporting local communities.

12.1. Pack Light

Packing light reduces your carbon footprint and saves on baggage fees.

12.2. Use Reusable Items

Bring a reusable water bottle, shopping bag, and utensils to reduce waste.

12.3. Support Local Businesses

Shop at local markets, eat at local restaurants, and stay at locally-owned accommodations to support the local economy.

12.4. Respect Local Culture

Learn about local customs and traditions and be mindful of your behavior to show respect for the local culture.

12.5. Conserve Resources

Conserve water and energy by turning off lights and appliances when you leave your accommodation.

13. Staying Safe and Secure While Traveling

Ensuring your safety and security is a top priority when traveling.

13.1. Secure Your Belongings

Use a travel lock to secure your backpack and keep valuables in a hidden pocket or money belt.

13.2. Stay Informed

Stay updated on local news and events and be aware of any potential safety risks.

13.3. Emergency Contacts

Keep a list of emergency contacts, including local police, embassy, and family members.

13.4. Travel Insurance

Purchase travel insurance to protect yourself against unexpected events like medical emergencies, lost luggage, and trip cancellations.

13.5. Trust Your Instincts

If something doesn’t feel right, trust your instincts and remove yourself from the situation.

14. Key Travel Phrases in Vietnamese

Knowing a few basic phrases in Vietnamese can enhance your travel experience and show respect for the local culture.

14.1. Greetings

• Hello: Xin chào (sin chow)
• Goodbye: Tạm biệt (tarm biệt)

14.2. Basic Phrases

• Thank you: Cảm ơn (gahm uhn)
• You’re welcome: Không có gì (khong koh zee)
• Please: Làm ơn (lahm uhn)
• Excuse me: Xin lỗi (sin loy)
• Yes: Dạ (da – used when speaking to elders or superiors) / Vâng (vuhng)
• No: Không (khong)

14.3. Useful Questions

• How much?: Bao nhiêu? (bao nhiêu)
• Where is…?: …ở đâu? (uh dow)
• Do you speak English?: Bạn có nói tiếng Anh không? (bahn koh noi tieng Anh khong)
• I don’t understand: Tôi không hiểu (toy khong hyoo)

14.4. Food and Drink

• Water: Nước (nuhk)
• Beer: Bia (bee-ah)
• Delicious: Ngon (ngon)

15. Unveiling Hidden Gems of Hanoi with SIXT.VN

Hanoi, the heart of Vietnam, is brimming with hidden gems waiting to be discovered. SIXT.VN offers expertly curated tours to take you beyond the typical tourist spots and immerse you in the authentic beauty of the city.

15.1. Beyond the Beaten Path

• The Train Street: A narrow residential street where trains pass just inches from the houses, offering a thrilling glimpse into daily life.
• Ngoc Ha Flower Village: A vibrant oasis of colorful blooms, where you can witness the artistry of local florists.
• Quan Chuong Gate: The last remaining city gate of ancient Hanoi, steeped in history and architectural charm.

15.2. Culinary Delights

• Hidden Alley Eateries: Venture into the winding alleys to discover local food stalls serving up authentic Hanoi cuisine, like “bun cha” (grilled pork with noodles) and “pho” (noodle soup).
• Egg Coffee Workshop: Learn the secrets of crafting the perfect “ca phe trung” (egg coffee) from a local expert.
• Street Food Tour: Embark on a guided street food tour to sample a variety of Hanoi’s culinary treasures.

15.3. Cultural Experiences

• Water Puppet Show Backstage: Get a behind-the-scenes look at the traditional water puppet show and learn about the art form.
• Local Art Galleries: Explore the hidden art galleries showcasing contemporary works by Vietnamese artists.
• Traditional Music Performance: Attend an intimate performance of traditional Vietnamese music, like “ca tru” (ceremonial singing).

15.4. Nature Escapes

• West Lake Sunset: Escape the city bustle and enjoy a tranquil sunset over West Lake, Hanoi’s largest lake.
• Eco-Tour to Co Loa Citadel: Discover the ancient Co Loa Citadel and surrounding countryside on an eco-friendly tour.
• Bird Watching at Thong Nhat Park: Spend a peaceful morning bird watching at Thong Nhat Park, a green oasis in the heart of Hanoi.

16. Common Mistakes to Avoid When Choosing a Backpack

Selecting the perfect travel backpack can be challenging, and it’s easy to make mistakes that can impact your travel experience. Here are some common pitfalls to avoid:

16.1. Prioritizing Style Over Functionality

While aesthetics are important, prioritize functionality when choosing a travel backpack. Look for features like comfortable straps, multiple compartments, and durable materials.

16.2. Ignoring the Weight of the Backpack

The weight of the empty backpack can significantly contribute to your overall load. Choose a lightweight backpack to minimize strain.

16.3. Not Considering the Climate

If you’re traveling to a rainy or humid climate, choose a water-resistant backpack to protect your belongings.

16.4. Overlooking Security Features

Protect your valuables by choosing a backpack with anti-theft features like lockable zippers, hidden pockets, and slash-proof materials.

16.5. Failing to Try It On

Whenever possible, try on the backpack before purchasing it to ensure a comfortable fit. Pay attention to how the weight is distributed and whether the straps dig into your shoulders.

17. Travel Insurance Essentials for Your Vietnam Trip

Travel insurance is a must-have for any trip, providing peace of mind and financial protection against unexpected events. Here are some essential considerations for your Vietnam trip:

17.1. Medical Coverage

Ensure your travel insurance policy includes comprehensive medical coverage for illnesses, injuries, and emergency medical evacuation.

17.2. Trip Cancellation and Interruption

Choose a policy that covers trip cancellations and interruptions due to unforeseen circumstances like illness, injury, or natural disasters.

17.3. Lost or Stolen Belongings

Select a policy that provides coverage for lost or stolen luggage, personal items, and travel documents.

17.4. 24/7 Assistance

Look for a travel insurance provider that offers 24/7 assistance in case of emergencies, including medical referrals and translation services.

17.5. Adventure Activities

If you plan to participate in adventure activities like hiking, rock climbing, or scuba diving, ensure your travel insurance policy covers these activities.

18. Travel Apps To Make Your Vietnam Trip Easier

In today’s digital age, travel apps can be invaluable tools for navigating new destinations, staying connected, and managing your itinerary. Here are some essential travel apps for your Vietnam trip:

18.1. Google Translate

Break down language barriers with Google Translate, which offers real-time translation of text, speech, and images.

18.2. Maps.me

Navigate offline with Maps.me, which provides detailed maps of Vietnam that can be downloaded for offline use.

18.3. Grab

Hail a ride with Grab, Southeast Asia’s leading ride-hailing app, offering convenient and affordable transportation options.

18.4. Agoda or Booking.com

Find and book accommodations with Agoda or Booking.com, which offer a wide range of hotels, guesthouses, and apartments in Vietnam.

18.5. XE Currency Converter

Stay up-to-date on exchange rates with XE Currency Converter, which provides real-time currency conversions for over 180 currencies.

19. Essential Gadgets for Modern Travelers

Traveling in the 21st century means staying connected and prepared with the right gadgets. Here are some essential gadgets for modern travelers:

19.1. Universal Adapter

A universal adapter ensures you can charge your devices in any country, regardless of the electrical outlet.

19.2. Portable Charger

A portable charger keeps your devices powered up on the go, especially during long flights or days of exploring.

19.3. Noise-Canceling Headphones

Noise-canceling headphones block out distractions and create a peaceful travel environment.

19.4. E-Reader

An e-reader allows you to carry multiple books without adding weight to your backpack.

19.5. Camera

Capture your travel memories with a high-quality camera, whether it’s a smartphone camera or a dedicated DSLR.

20. What To Do In Case of Emergency

Knowing what to do in case of an emergency can be crucial for your safety and well-being while traveling.

20.1. Stay Calm

In any emergency situation, the first step is to stay calm and assess the situation.

20.2. Contact Local Authorities

Contact the local police or emergency services for immediate assistance.

20.3. Notify Your Embassy

Notify your embassy or consulate of the emergency and request assistance.

20.4. Seek Medical Attention

Seek medical attention if you’re injured or ill.

20.5. File a Police Report

File a police report if you’re a victim of a crime.

21. Top Tourist Destinations in Vietnam and What To Pack

Vietnam offers a diverse range of attractions, from bustling cities to tranquil beaches. Here are some top tourist destinations and what to pack for each:

21.1. Hanoi

• What to Pack: Comfortable walking shoes, light layers, rain jacket, and a small backpack for day trips.

21.2. Ha Long Bay

• What to Pack: Swimsuit, sunscreen, hat, sunglasses, and waterproof bag for electronics.

21.3. Hoi An

• What to Pack: Light clothing, comfortable sandals, and a reusable shopping bag for visiting local markets.

21.4. Ho Chi Minh City

• What to Pack: Light clothing, comfortable walking shoes, and a small backpack for exploring the city.

21.5. Sapa

• What to Pack: Hiking boots, warm layers, rain gear, and insect repellent.

22. FAQs About Backpack Sizes for Traveling

22.1. What size backpack is considered carry-on?

Generally, backpacks under 50 liters or 22 x 14 x 9 inches are considered carry-on, but always check with your airline.

22.2. Is a 40L backpack too big for carry-on?

A 40L backpack is often acceptable, but ensure it meets the specific size and weight restrictions of your airline.

22.3. What is the best backpack size for a weekend trip?

A 25-30 liter backpack is ideal for weekend trips, offering enough space for essential clothing and toiletries.

22.4. Can I use a hiking backpack for travel?

While possible, hiking backpacks lack organization and are less professional than travel-specific backpacks.

22.5. How do I measure my torso for a backpack?

Measure from the C7 vertebra (the bony bump at the base of your neck) to the iliac crest (the top of your hip bone).

22.6. What is an expandable backpack?

An expandable backpack has a compartment that can be unzipped to increase the bag’s capacity, providing extra space when needed.

22.7. What are packing cubes and why should I use them?

Packing cubes are fabric containers that compress clothes, keep items organized, and maximize space in your backpack.

22.8. How do I clean my backpack?

Wipe down your backpack regularly with a damp cloth. For deeper cleaning, hand wash with mild soap and water and let it air dry.

22.9. What should I do if my backpack is lost or stolen?

File a police report, contact your travel insurance provider, and notify your embassy or consulate.

22.10. What are some anti-theft features to look for in a backpack?

Look for lockable zippers, hidden pockets, slash-proof materials, and RFID-blocking technology.

Choosing the right backpack size is essential for a comfortable and efficient travel experience. At SIXT.VN, we aim to provide the best travel solutions for your Vietnam adventure, from airport transfers to tailored tour packages. Let us assist you in planning your journey, ensuring every detail is taken care of. Contact SIXT.VN at Address: 260 Cau Giay, Hanoi, Vietnam. Hotline/Whatsapp: +84 986 244 358 or visit our Website: SIXT.VN for more information.