Thread: thing I found in the Caravan

My recently deceased wife (Amanda) had a propensity for buying camping stuff (she was into camping I wasn't) and I found this in the caravan.

Its a long narrow nylon double pouch - there's two distinct nylon pouches, one on top of the other
The openings at the top are springy plastic, edged with black nylon.
The pouches are joined along one side but only at the top and bottom of the other side
Each pouch has a clear thick polyethylene inner liner.

BLUEPLASTICTHING1.JPG

It rolls up and then folds over and one side of the the top is clipped to the other by plastic snap clips
BLUEPLASTICTHING2.JPG

anyone have clue as to what this might be.
I though it might be a waterproof sleeping bag cover but
- the pouches appear too narrow.
- the way the two pouches are joined suggests something else.

Any ideas?