I'm selling a mixture of items - some single items of clothing, some bundles, some non clothing smallish items, the odd book etc. So I need a batch of mixed sizes I guess with some big ones included. See quite a few on eBay to buy but can anyone recommend ones that are strong, waterproof, good seals etc? I've bought a couple of mixed 5 packs from Morrisons so far for about £4 
but I know I can get a better value pack but not sure which ones to go for.