Plastic Sheds?

TDA10

As an aside, I have one of the metal ones and although putting it up was a total PITA it is actually very sturdy and waterproof.

Mine is just sat on the patio with no separate base and I have allsorts of sh1te, erm I mean things in it From decorating stuff and old clothes to tools and car accessories. None of it is damp or rusty and as it's metal there is (IMO) less chance of getting broken in to as when you open the sliding door it makes a right ol' racket! But it has a quite sturdy locking ability though (if you use a decent padlock of course! )

Mine was also from Argos about 5 years ago and it's also been moved around 3 times (I'm very indecisive! ) and hasn't affected it's strength either.

I also have one of the plastic storage 'things' that fit say, some relaxer cushions in and that too doesn't seem to get damp, but snails have somehow got into it and eaten cardboard off some items stored in there.

HTH!