I'm pissing off to watch Dexter and Walking Dead
Use a measuring jug to fill your bin with water so you know how big it is, alternatively take it down the shop and try before you buy. I'm sure they wont mind.
It's got holes in the bottom, and I'm fucked if I'm carrying it to Asda.
You could plug the hole and submerge it in a larger container full of water then measure the amount of water displaced?
Get to fuck, ASDA own brand all the way.