My only suggestion is to get something with a bit of foam for the slipping around. We were given 2 tubs as hand me downs and ended up hating the one with a mesh sling once she was to big for the sling part. The one we use is very simple and has a bunch of foam lining the inside, it helps keep DD from slipping when she kicks and splashes.
If I were you I would not get the first on it is $$$ and would be a pain to store. Simple and light is the way to go.