Where do people get them from?! I think I must be being stupid because I can't find them online anywhere. In need of new ones as the bags my rugs came in have all split.
Google Horse rug storage bags and several companies should come up on the search, like Shires etc. There's even one company that personalises them. It's a pricey option though, a storage bag from Ikea or Dunelm would probably be cheaper.
Mine did too. I use "Dimpa" bags from Ikea. £2.99 each. Large enough for 2 heavy weight turnouts or 6 odd fleeces. (and pretty much everything in between...) Had the oldest of them about 3 years I think - still going strong.