Backfloat

The Backfloat is a delightfully practical safety device that brings together the best of two worlds. Partially inflate and attach to your seat back for an exceptionally comfortable and adjustable seat back pad with a storage pocket on the back. It provides excellent low back support, and allows easy adjustment as you travel.

Quickly detached and fully inflated, the Backfloat becomes an easy to use and very effective paddle float. However, the most important aspect of the Backfloat is that you have a good reason to have it with you. Once mounted to the kayak, even uninflated, it is comfortable and needn't be removed.

This ensures its availability when you need it as a paddle float.  This will fit any hinged seat.