Ergobaby 360 storage

Hi everyone. We have the Ergobaby 360 pictured below. It is NOT the Omni version so it doesn’t have a storage pack. When I’m shopping I just need a space to hold my keys, phone, and wallet. Any suggestions? How do you store these items so they’re easy to access, without using an extra hand/arm to carry a purse or something else that could accidentally hit my baby while in the carrier?