the flexible one you refer to is the kayatank. I have one....it is pretty good....but I have had a few issues with it. It fills partly with water automatically (because below the water line)-- so even if I don't have any baits to keep alive, I am always dragging around a few extra gallons of water. I also had a switch go out on me....easily replaced. Finally-- my intake opening on the bottom of the yak has gotten chewed up a bit from heavy use--- landings on rocky beaches mainly.
The kayatank is great for someone who always fishes live bait and launches out of soft sandy beaches (GREAT FOR LJ).
If you sometimes plan to only fish plastics-- a little bit of a pain.
You also give up inside storage for the kayatank.
Finally, having the plumbing on the bottom of the kayak is a little unnerving-- I find myself checking it frequently for leaks-- none yet (had the tank for 1 1/2 yrs now!)
Having the tank in front of me between my legs is SUPER easy. I usually just shake off my bait from the sabiki, and they fall into the tank. Usually I don't have to touch the bait until just before going on my hook! Stay alive ALL day....I end up sending many off on their merry way at the end of a trip.
Finally-- the kayatank is probably the most expensive bait system out there. The other tanks that go behind you are cheaper
Pros and cons-- decide for yourself.
Jason
