Something like a safe deposit box should be a single page document with something like this:
- cost is $X/month and prices are revaluated every Y months and can increase by a maximum of $Z/month - may access the box X times/month without any additional fees - bank's liability is max $X or Y months of rent, whichever is higher/lower - if rent is not paid, X happens, and after Y months of non-payment, Z happens - policy/fee for lost keys
I haven't actually opened one, but I wouldn't be surprised if the contract was 10 pages long and the maximum liability was somewhere in the middle in fairly small print.