I like your suggestion Ina
We use ours for all sorts of things - covering the car windscreen when there's a frost due, filling with persistant weeds which need to die before they can be composted, as rubbish sacks in the polytunnel, workshops, garage etc, feedbags for sheep at shows, stuffed with hay or fresh grass (with a single small hole cut) and there are always people who want some - same with empty licky buckets.
Oh yes - I use them to put salted sheep skins in for sending them to the tanners, as long as they don't have any holes.