Every item on this list needs a container, and this is the one. It compresses to carry-on size when the trip is short and expands when the trip is not. Sensible, weatherproof, and guaranteed for life, which is the point.

Specifications

  • Collapses to a 35L carry-on-compliant size and expands to 45L, per Peak Design
  • Weight: 2.05 kg / 4.52 lb
  • Weatherproof 100% recycled 400D nylon canvas shell with 900D bottom liner
  • Fair Trade Certified and 100% carbon neutral
  • Covered by the Peak Design lifetime guarantee
  • Top, side, front, and rear access via weatherproof UltraZips
  • Padded sleeves for a 15-inch laptop and a 10-inch tablet
  • Dimensions: 22 x 13 x 9.5 in, expanding to 22 x 13 x 11 in
  • Price verified 23 Sep 2026; Peak Design runs periodic sales

$299.95 · Price via Travel Backpack 45L, peakdesign.com

Method. Compiled from published specifications and maker materials. This is not a hands-on test.