Page 4 of Gregory Hiking Backpacks

Consider your activity

Hiking: Often compatible with hydration reservoirs, have external gear straps/loops
Running: Designed to limit bounce, hydration compatible
Climbing: Slim profile, abrasion-resistant reinforcements
Cycling: Road cycling packs compact with lower profile; MTB packs hold more gear

How much gear will you carry?

10L or less: Short runs, quick outings, casual use, essentials only
11–20L: Day hikes, cycling, can carry an extra layer
21–35L: Sweet spot for multi-hour or full-day hikes, travel
36–50L: Gear-heavy outings l(all-day hikes, climbing), winter hiking, ultralight backpacking

Internal frame or frameless?

Find the right fit

Use torso length (not overall height) to find your pack size
Measure your hip circumference (slightly higher than your pant-waist size) and check that against the hipbelt size

Capacity

Trip duration is the biggest factor. General guidance:

Features
Consider frame type, storage, padding and ventilation.

Fit
Sizing is based on torso length (not height) and hip circumference. Sizing can vary by brand and model, so check a pack's size chart.

Finding torso length and hip circumference

Locate your C7 vertebra by tilting your head forward and feeling for the bony bump between your shoulder blades.
Place your hands over your hip bones. Draw an imaginary line connecting your thumbs across your lower back.
Stand up straight. Have a friend measure from your C7 vertebra to the imaginary line between your thumbs. This is your torso length.
To find hip size, measure around the top of your hips, using the same imaginary line you found earlier.

Gregory Hiking Backpacks