Andrew Gabriel wrote:

I had saved quite a lot of Waitrose ones from before the 5p charge,
as I use them as kitchen bin liners, having bought a bin designed
to used regular carrier bags as liners. However, they fell to pieces
after about a year, and that was without any sunlight.

Some carriers (e.g. tesco pre carrier charge) and magazine wrappings
(e.g. New Scientist) are/were oxygen degradeable.