Backpack Size Guide by Trip Type
Getting the right pack size is crucial. Too small and you'll be strapping gear to the outside; too large and the extra weight and bulk will slow you down. This guide covers the recommended volume ranges for every type of trip, from a quick day walk in the Peak District to a long-distance thru-hike.
Recommended Pack Sizes
| Trip Type | Volume (litres) | Typical Load (kg) | What Fits |
|---|---|---|---|
| Day hike (summer) | 15–25 L | 3–6 | Water, lunch, waterproof, first aid, sun cream, map |
| Day hike (winter) | 25–35 L | 5–8 | As above plus extra layers, flask, head torch, emergency shelter |
| Overnight (hut/bothy) | 30–40 L | 6–9 | Sleeping bag, mat, food, stove, change of clothes |
| Overnight (wild camp) | 40–50 L | 8–12 | Tent/tarp, sleeping system, stove, food, water treatment |
| Weekend (2–3 nights) | 45–60 L | 10–15 | Full camping kit, 2–3 days food, spare clothing |
| Multi-day (4–7 nights) | 55–70 L | 12–18 | Full kit, week's food, extra fuel, repair kit |
| Thru-hike (resupply every 3–5 days) | 50–65 L | 10–15 | Lightweight kit, 3–5 days food between resupply points |
| Ultralight thru-hike | 35–50 L | 5–9 | Minimalist UL kit, tarp/bivy, 2–4 days food |
| Expedition / winter mountaineering | 70–90+ L | 18–25+ | Heavy-duty tent, 4-season bag, climbing gear, extended food supply |
Torso Length & Fitting Guide
Your torso length — not your height — determines your pack size. Measure from the C7 vertebra (the bony bump at the base of your neck) down to the top of your hip bones (iliac crest).
| Torso Length (cm) | Pack Size | Typical Height Range |
|---|---|---|
| Up to 40 cm | Extra Small | Under 155 cm (5'1″) |
| 40–45 cm | Small | 155–168 cm (5'1″–5'6″) |
| 45–50 cm | Medium / Regular | 168–180 cm (5'6″–5'11″) |
| 50 cm and above | Large / Long | 180 cm+ (5'11″+) |
Height ranges are approximate. Always measure your torso for the most accurate fit. Many packs offer adjustable back systems.
Plan Your Pack
Use our gear calculators to figure out exactly what you need to carry:
- Packing & Gear Calculators — build your gear list, estimate pack weight, and find the right volume for your kit
Volume ranges are general guidelines. Your actual needs depend on the bulk of your gear, the season, and personal packing style. Compressible down sleeping bags and ultralight shelters can significantly reduce the volume you need.