HelloCustomer and welcome back to Just Answer!

If you don't want your sister's name on the account, then a safety deposit box would not be an option.

The only way that both of you could have access to certain items is to purchase a home safe and both have the combination, or buy a safe that has a feature which allows more than one combination to be programmed. In this way, you can each have access to the safe and it's contents, but you can each have separate combinations, if this is the way you want to go.

If there is someone that both you and your sister trust and would agree to have on a safety deposit box account with you, and this person could act on her behalf or sign in with only you present, that's another option; however, if you don't want anyone on the safety deposit box account with you, then that wouldn't work.

Consider the home safe. There are many that are not that expensive and I can recommend some that have a programmable function (on an electronic lock) where two separate combinations can be entered to access the safe, if this would suit your purposes.

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Best regards,
Cher
Cher41090.1993128125