Bags and accessories

Fit and sizing

Measurements, sizing systems and how to check before ordering.

1 guides

Green children's backpack with a printed name and sports motif hung on a yellow chair by a desk — Personalised school packs are sized for a child's back, which matters more than the print on the front.Photo: Personal Creations · CC BY 2.0 · Wikimedia Commons · Open source page

Loaded grey and blue hiking rucksack propped by a front door with trekking poles and walking boots

Fit and sizing

Sizing a backpack: torso length, load weight and where the weight sits

Fit a pack by torso length rather than height, keep the load under a defined share of body weight, and adjust the straps in the order that actually works.

Updated 11/3/2026 · 9 min

Photo: SGrabarczuk (WMF) · CC BY-SA 4.0 · Wikimedia Commons