We have many sizes to suit your needs:
(1st number is approximate width inside unit, 2nd number is approximate depth)
5 x 5
5 x 10                
10 x 5
10 x 10
10 x 15
10 x 20
10 x 30
10 x 35

No long term commitment!   1 month minimum
Convenient, drive up to your unit 24/7