How does the Evac UL differ from a standard dry bag?

The base is air-permeable, so trapped air escapes as you roll and compress. A standard dry bag holds that air, which makes soft gear harder to shrink.

Is it fully waterproof?

Yes, the nylon fabric and taped seams are waterproof and the roll-top closure seals the top. The venting base passes air but is built to keep water out in normal use.

What fits in the 20-liter size?

It holds a sleeping bag, a puffy jacket and spare layers, or a day's clothing. It is sized for a main pack compartment rather than a whole trip's gear.

Does it work for kayaking and bikepacking?

Yes. The roll-top closure and waterproof fabric suit spray and rain, and the compression keeps the load tight in a kayak hatch or frame bag.

How should I care for it?

Wipe it clean and dry it fully before storage. Keep it away from sharp objects and avoid leaving it in standing water, since the thin fabric and venting base are the vulnerable parts.