This tough waterproof bag folds out into a flat 1m diameter changing mat for you to stand on whilst getting changed.  It's perfect for use in carparks when getting out of your wetsuits.  Just throw all the wet gear into the bag, pull up the drawstrings and it's packed neatly away.  The material is fully waterproof and very heavy duty so can be washed down and wont leak if a wetsuit is left inside it.