Outside storage.

If you are considering buying sheds from lowes or the store don't... You can build much stronger, larger, better, cheaper ones out of some 2x4's and cheap siding. And some shingles, even go dumpster diving at new construction sites and you could make them for free. Another idea if your looking to spend a bit of $ for a long term solution do something underground like a buried cellar or such, or a home addition. Possibly consider renting a storage unit if your work permits, you can get a good one for $50 a month.