The Ultimate Guide to Travel Backpacks: Sizes, Uses & Choosing the Right One
Why the Right Backpack Matters
When it comes to travel backpacks, I have more than a few. From day packs to overnight packs, rolling backpacks to hydration packs, and even specialized camera backpacks—I own them all. Why? Because having the right backpack can make or break your journey.
A great backpack isn't just about size; it’s about comfort, durability, and functionality. The best ones offer:
Adjustable, padded shoulder straps for comfort
A ventilated back panel to prevent overheating
A sturdy frame for even weight distribution
Multiple compartments for organization
Reinforced stitching for long-lasting durability
How to Choose the Right Backpack
The ideal backpack depends on your destination and purpose. Whether you're exploring a city, embarking on a multi-day trek, or packing for a rugged adventure, there’s a perfect backpack for every scenario. But how do you determine the best size? Let’s break it down.
Backpack Sizes & Their Uses
Backpacks are measured in liters (L), reflecting the total volume they can hold. Here’s a guide to choosing the right one:
1. Extra Small (10L – 20L) – Everyday Essentials
Best for: Day trips, urban commuting, ultra-light travel.
Use case: Holds essentials like a wallet, phone, water bottle, and a light jacket.
Example: A 15L backpack is perfect for carrying an iPad, snacks, and a guidebook while exploring a city.
Brand Recommendation
- Patagonia Atom Sling 8L
- Osprey Daylite 13L
- Bellroy Classic Compact 20L
2. Small (20L – 30L) – Perfect for Weekends
Best for: Weekend trips, carry-on personal items, daily commuting.
Use case: A 25L backpack fits a change of clothes, a small toiletry bag, and a laptop—ideal for weekend getaways.
Example: Many minimalist travelers use a 30L pack as their only bag for multi-day trips.
Brand Recommendation
- Nomatic Backpack 20L-24L
- Timbuk2 Authority Pack 22L
- Osprey Tropos 26L
3. Medium (30L – 40L) – The Ideal Carry-On
Best for: Short-term travel (3-7 days), lightweight one-bag travel.
Use case: A 35L backpack holds a week’s worth of clothes, toiletries, and travel gear—perfect for one-bag travelers.
Example: A 40L bag is the maximum size allowed for most airline carry-ons.
Brand Recommendation
- Peak Design Travel Backpack 30L-35L
- Nomatic Travel Pack 40L
- Tortuga Travel Backpack 40L
- Osprey Farpoint/Fairview 40L
4. Large (40L – 50L) – Versatile for Longer Trips
Best for: 1-2 week trips, adventure travel, backpacking.
Use case: Spacious enough for extra clothes, shoes, and gear while still being manageable for carry-on.
Example: A 45L backpack is ideal for digital nomads or extended trips.
Brand Recommendation
- Tom Bihn Aeronaut 45L
- Osprey Porter 46L
- Deuter Aviant Access Pro 50L
- REI Co-op Ruckpack 50L
5. Extra Large (50L – 70L) – Checked Baggage Range
Best for: Long-term travel, trekking, camping.
Use case: A 60L backpack can fit cold-weather gear, hiking supplies, or extended travel essentials.
Example: A 55L travel backpack works well for both city and outdoor adventures.
Brand Recommendation
- Gregory Baltoro 65L / Deva 60L
- Osprey Atmos AG 65L / Aura AG 65L
- Deuter Aircontact Lite 60+10L
6. Expedition Size (70L – 100L+) – Built for the Extreme
Best for: Multi-week expeditions, long-term backpacking, mountaineering.
Use case: Designed for serious outdoor adventures like trekking the Himalayas or thru-hiking long trails.
Example: A 75L pack is great for carrying camping gear, food, and extra clothing for extreme climates.
Brand Recommendation
- Osprey Aether AG 85L / Ariel AG 75L
- The North Face Banchee 90L
- Hyperlite Mountain Gear 70L+
Bag styles change regularly with fashion and functionality trends, but their primary purpose—carrying and organizing belongings—remains the same. Check company websites for the latest models.
Which Backpack Size is Right for You?
Short trips (1-3 days): 20L – 30L
Week-long trips: 30L – 45L
Long-term travel (1+ weeks): 45L – 65L
Outdoor & expedition travel: 65L+
A well-made backpack will be your travel companion for years, carrying not just your gear, but memories from around the world. Choose wisely!
Pro Tip: Consider Warranty & Repair Policies
Some brands offer lifetime warranties and repair services to ensure longevity:
- Osprey "All Mighty Guarantee" – Free repairs for any damage.
- Patagonia "Ironclad Guarantee" – Repairs or replaces faulty products.
- Nomatic & Peak Design – Strong warranties with excellent customer support.
- Deuter & Gregory – Lifetime warranties on manufacturing defects.
Affordable Travel Backpacks Under $100
Travel backpacks can be pricey, often exceeding $300, but you don’t need to spend that much to get a reliable and functional bag. Here are a few budget-friendly options, all priced at $100 or less:
- Matein Travel Laptop Backpack – $40-$50
- Amazon Basics Carry-On Travel Backpack – $50-$70
- Osprey Daylite Plus – $75-$90
- REI Co-op Ruckpack 18 – $80-$100
- Venture Pal 40L Lightweight Backpack – $30-$40
- WITZMAN Vintage Canvas Backpack – $50-$70
- High Sierra Loop Backpack – $40-$60
- Big Easy Water Resistant 17” FŪL Backpack — $50-$100
- Urban Hicker Travel Backpack — $30-$100
These backpacks offer a balance of affordability, durability, and functionality—proving you don’t have to spend a small fortune to find a great bag!
