Just thought I had better add, they aren't mouse/rat proof though (obviously being plastic) - we had rats get in one with my rugs and chewed them to pieces!
Bit of a random story but I had one identical to that (B&Q btw) until the hippo sized cob in the stable next to mine went crazy due to no turnout, reared up at the door, got one foreleg stuck over the door, then the other one, then climbed over the door landing on his head and somersaulting his full body onto my box which smashed into a thousand pieces. One of the most incredible things I have ever witnessed
I have one, had it good 7 years now since I came to England. Its fantastic as huge and solid (I stand on it, sit on it, pile stuff on it etc) It has got dodgey wheel things (which I think newer designs have better versions of) but even though dodgey make it far easier to move as you can drag it. Had a few issues getting base in properly but once in was fine. It is obviously popular box as there have been about another 6 or 7 appear on the yard since mine over the years
They are great - I have had mine for years, but if you have a rat and mice problem, the pests can and do get in so you do need to keep a regular check on rugs stored in them.