john west wrote

Having a lot of stored Junk, we have the problem of bringing
it down a ladder and sorting it and then putting some back.

Supermarket plastic carrier bags were good for storage and very
handy to carry up and down the ladder, but i think most are now
probably degradable' and will soon fall apart into a thousand pieces.

They always did even when not biodegradable.

Are there any plastic bags (maybe some bin bag types or
similar?) that will not be degradable, that any one knows of ?

The replacement long life shopping bags obviously.