Long-lasting inflatable seat cushion
I've been using the Corflex Medic-Air Seat cushion for many years.  It has two advantages.  The 1st is that you can inflate it to exactly the firmness you want.  The 2nd is that you can deflate it and fold it flat when you take it with you.  Unfortunately, the little tab on the stopper usually breaks off after a few deflations, and after that I can never pry the stopper open again.  Luckily, the stopper  is airtight, and I don't like the cushion very firm so I can (sort of) fold it and fit it into my backpack and, of course, it hardly weighs anything.<br />I have never had  one of the cushions wear out; I just tend to forget them on planes or trains or rented cars, and I continue to reorder..
Rating: 4 stars