Thanks for the comments folk.
They are buckets, containers, bags, whatever you want to call them and they can be used for many things, nut and berry collecting for example.
In the wilds without the use of your kit bag this would be the way to go - creating your needs from the environment. Yes, the one on the left is ash although it
does not fold as well as many other barks but it can be utilised in another way - this is a ash water bucket (below) which I will line with pitch when I get the time.