This is very light! When I got it out of the package, I couldn't get it to unfold correctly...just couldn't fully untwist it.

I figured that it was defective, so I sent to a picture of the problem to Sea To Summit. They responded that the plastic tube in the brim can take a set if it is kept folded up too long. The remedy that they suggested was to immerse the sink in hot (but not boiling) water, which would allow the brim material to relax into the proper shape. This worked well, although I may do it a gain with just a bit hotter water to see if the last touch of a wave will come out of it.

I thought I would just pass along that tip....