How to Choose a Backpack for Travel: Size, Features & Fit
By NEMO Equipment | Published: 2026-10-19
Category: Buying Guides
Learn how to pick the right travel backpack by matching capacity, opening style, and features to your trip length and packing style. Compare 20L, 30L, and 40L options from NEMO Equipment.
Quick answer
For most overnight or multi-day trips, a 30L to 40L travel backpack with a duffel-style opening and a laptop sleeve offers the best balance of capacity, organization, and carry-on compatibility. If you only need a daypack for commuting or short outings, a 20L version is lighter and more compact.
Capacity matters more than you think
The biggest mistake travelers make is choosing a backpack that is either too large to carry comfortably or too small to fit their gear. A 20L pack is ideal for a day trip or as a personal item on a plane, but it won't hold a change of clothes and toiletries for an overnight stay. A 30L pack hits the sweet spot for most weekend trips, while a 40L pack gives you room for bulkier items like a jacket or extra shoes without exceeding typical carry-on size limits.
Opening style changes how you pack
Traditional top-loading backpacks force you to dig through layers to find items at the bottom. Travel backpacks with a duffel-style opening—like the full-zip clamshell or U-shaped zipper—let you open the entire main compartment like a suitcase. This makes packing cubes and organization much more practical, especially when you are living out of your bag in a hotel or hostel.
Durability and materials affect weight and longevity
A travel backpack that gets checked, tossed into overhead bins, or dragged through airports needs tough fabric and reliable zippers. Many modern packs use recycled or exclusive materials that balance weight and abrasion resistance. A heavier, more durable fabric may be overkill for a commuter pack but welcome for a bag that sees regular travel use.
How to choose your travel backpack: decision rules
- Trip length: For a day trip or commute, choose 20L. For an overnight or weekend, choose 30L. For 3-5 days or when packing bulkier gear, choose 40L.
- Carry-on vs checked: If you plan to carry on, verify the backpack's dimensions against your airline's limits. 30L and 40L packs are usually carry-on friendly, but a fully packed 40L may be too tall for some budget carriers. Measure your pack when full, not empty.
- Opening style: Prefer a duffel-style (full-zip clamshell or U-shaped) opening for travel. It makes packing cubes accessible and lets you see everything at once. Avoid top-loading packs for trips where you need frequent access to items at the bottom.
- Laptop and organization: If you travel with a laptop or tablet, choose a pack with a dedicated padded sleeve. External pockets for water bottles and quick-access items also reduce the need to open the main compartment.
Travel backpacks compared
- Vantage™ 40L Endless Promise® Overnight Travel Backpack: The Vantage™ 40L Endless Promise® Overnight Travel Backpack features a duffel-style opening and a large exterior pocket that stashes several days’ worth of clothing. If you need a carry-on-sized bag for a 3-4 day trip, this 40L pack gives you the space to pack bulkier items while still fitting most airline overhead bins.
Vantage™ 40L Endless Promise® Overnight Travel Backpack - Vantage™ 30L Endless Promise® Overnight Travel Backpack: The Vantage™ 30L Endless Promise® Overnight Travel Backpack also has a duffel-style opening and a dedicated laptop sleeve. The 30L version is a better choice for weekend trips or as a personal item on flights where space is tight, and the laptop sleeve keeps your work gear separate from your clothes.
Vantage™ 30L Endless Promise® Overnight Travel Backpack
Which travel backpack is right for you?
Best for
- Travelers who want one bag for weekend trips and daily use
- Anyone who prefers a duffel-style opening for easy packing
Not for
- Hikers who need a technical top-loading pack with a frame and hip belt for long trail days
