The Thule Stir Alpine 40L is a larger hiking and alpine backpack for users carrying more technical or overnight gear than a normal 10–18L daypack.

Quick Answer

Choose Stir Alpine 40L when hiking, climbing or alpine travel requires substantially more gear than an AllTrail daypack can carry. Forty liters is enough to support a compact overnight or technical day load but can be excessive for short casual hikes.

As an Amazon Associate, Backpacks4Less may earn from qualifying purchases.

Compare current Thule hiking backpacks.

40L Capacity

Forty liters can carry extra layers, food, technical gear, a compact sleep system or climbing equipment depending on the activity.

Alpine and Climbing Use

Technical routes place a premium on stable load carry and access to gear without excessive external snag points.

Stir Alpine vs AllTrail

AllTrail 10L–18L models are better for normal day hiking. Stir Alpine 40L is the larger technical choice when the route requires significantly more equipment.

Travel Use

Stir Alpine can transport outdoor gear, but its hiking orientation differs from Thule’s travel-focused Landmark and Aion families.

Weather

Alpine conditions can change quickly. Do not rely on the backpack shell alone for critical dry storage; use internal waterproof protection where necessary.

Frequently Asked Questions

Is 40L enough for overnight hiking?

It can be with compact gear and suitable conditions.

Is Stir Alpine good for a normal day hike?

It can work, but it is more pack than most light day hikes require.

How does it compare with AllTrail?

Stir Alpine targets larger and more technical loads; AllTrail is the better general day-hiking family.

Final Verdict

Stir Alpine 40L gives Thule a genuine technical-hiking option above its compact AllTrail packs. Choose it when the route and equipment justify the capacity.

Browse Thule Backpacks and our AllTrail guide.

Shop current Thule hiking backpacks.