What size backpack for seven nights?

For seven nights (eight days on trail), the brands' guidance runs 60–100 L. Gregory gives 60–100 L, Gossamer Gear points to its 60 L packs, and Osprey to 70–80 L.

1Top of range 100 L
2Bottom of range 60 L
3Trip 7 nights · 8 days
4Winter, Gregory +10–15 L

Each brand for seven nights

Brand	What it says	Volume
Osprey	a 70-80 L pack is a solid choice for more than a week's worth of travelling; said of travel	70–80 L
Gregory	Multi-Day Hike Remote (Baltoro & Deva); no night count given	60–100 L
Gossamer Gear	7+ day trips	60 L
All brands	no single volume every row shares	60–100 L

Guidance: Osprey backpack size guide; How to choose the perfect hiking backpack; What size backpack do I need for backpacking? (11 Mar 2026). Last checked 2026-10-20.

Pack volume for seven nights on each brand's guidance, one bar per printed recommendation that covers the trip.

Why the brands differ for seven nights

Gregory's "Multi-Day Hike Remote" row gives 60–100 L and says it fits bulky gear, 4-season tent, insulated cooking, extra food. Gossamer Gear builds lighter packs for hikers with pared-down kit, and its picks for eight days (60 L) sit at the low end of the span. Its own line: "When your gear is dialed in, 40 to 42 liters is more than enough for multi-day adventures."

Osprey's guide says a 70-80 L pack is a solid choice for more than a week's worth of travelling, a figure written for travel rather than trail. In Osprey's trip-length categories this span covers Extended Treks, Expedition Packs.

Adjusting the volume

Winter: Gregory says to plan for an additional 10 to 15 litres, which turns this span into 70–115 L.
Base weight: Gossamer Gear's question is "Is my base weight under 15 pounds or closer to 25?" A lighter, compact kit sits at the bottom of the range; bulky sleeping bags and tents at the top.
Food and water: longer food carries, a bear canister or long dry stretches all push toward the top, per Gossamer Gear.
Fit: Osprey: "The pack's back length should match your torso length rather than your height." Gregory: "Ideally, about 70% of the weight should rest on your hips, with the remaining 30% supported by your shoulders."

Shorter and longer trips

Six nights reads 50–100 L.

For seven nights these are the brands' published starting points; how you pack decides where you land. See the methodology for how nights and days are matched.

Other gear

Other trip lengths

a day hike · one night · two nights · three nights · four nights · five nights · six nights · all trips

Guide: pack volume vs base weight · size every category at once