This is a sleeping bag liner. Given that Sea To Summit makes excellent sleeping bags, one would expect their liners to fit in perfectly, but unfortunately this isn’t the case.

The liner and it’s stuff bag. (Own work. License: CC-BY-SA.)

The hood

For a longer person this is just too short. The 2 dimensional hood flap will escape from under your head when twisting and turning in the bag. There really should be a 3D sewn hood for it to stay in place (+ a little longer overall).

The bad hood is really a bummer because it’s precisely the head that usually exerts the most dirt to the sleeping bag.

The rest

The lower parts of the liner are ok. It also packs into a really small pouch. Gets all crumbled up as you can see in the picture, but who cares.

The verdict

This isn’t all terrible, but as it’s also quite pricey, try to find something else.