Extension collar at a glance
- Typical extra volume
- 5 to 10 L
- Best for
- Food-heavy first days, bulky canisters
- Cost of using it
- Higher center of gravity
Where to find it
Look inside a top-loader past the point where the pack body ends and you'll usually find a lighter tube of fabric continuing upward with a drawcord at the top. That's the collar. Most of the time it's folded down inside and you never think about it.
The day it earns its keep
It earns its keep on the day you're carrying more than usual: a bear canister, a week of food out of a resupply, a friend's share of the tent. Pull it up, cinch it, let the floating lid rise to meet it, and the pack takes another 5 to 10 liters without complaint.
What it does to how the pack carries
Using it changes how the pack carries, though, and not for the better. Everything you add sits high, above the frame's best load path, which raises your center of gravity and makes the pack want to steer you on uneven ground. It's the right tool for the first two days after a resupply and the wrong one as a permanent arrangement.
What this means when you're choosing
- Whether the collar is a full tube or a token few inches
- A floating lid, which can rise to cover a filled collar
- Compression straps that still work with the collar rolled down
The common mistake
Treating the extra capacity as free
Everything the collar holds sits high and behind the frame, which is the worst place for weight. It is there for the day you come out of a resupply with six days of food, not as a reason to buy a smaller pack.
Common questions
Does the quoted pack volume include the extension collar?
Usually not, though brands differ and a few quote a range that does. If a 60 L pack is advertised as 60+10, the collar is the +10.
Should I use the collar on every trip?
No. Packing high makes a pack unstable, so use it when your food carry genuinely needs it and roll it back down once you've eaten a few days' worth.