It's a bag. It's a sit mat. It's reversible.
An incredibly strong bag fitting up to A3. A simple, single shoulder strap allowing the bag to sit on your shoulder, tucking under your arm. It's reversible giving you two colour options! When it's empty it can be used as a sit mat with one side and the base being waterproof rip-stop nylon which is also wipe clean meaning you won't have to wash it so often, though you can just chuck it in the washing machine. The colours won't fade.
All made from 100% recycled fabric, in Britain.