a collapsible wash bowl or a groundsheet (both green, both ex French army)
In the first picture, the groundsheet is on the left
folded four times. It's about 3m x 2m. The bowl is on the right. It sort of crumples rather than folds.
http://www.jubileegroup.co.uk/JOS/misc/dscf3855.jpg
In the second picture, there is just the bowl, with four litres of water in it. Tested for free.
With warm water it goes more circular more quickly. Being ex-army it's pretty tough material, a lot tougher than the ones you usually get in camping shops.
You can just about carry it full of water but I don't recommend doing any great distance.
http://www.jubileegroup.co.uk/JOS/misc/dscf3856.jpg
I've just noticed in the second picture there's what looks like a stain on the right of the bottom of the bowl. I didn't see that when I was taking the photo. It's actually some kind of reflection, there's no mark on the bottom of the bowl.