For storing beverages that cannot be drunk at one time. I found a cap that can be attached to canned juice and canned beer, and bought it.
A product called "Mini Mini Daisakusen Can Cap Free 2 Pieces" sold by Pearl Metal. There are two grooves on the back side of the cap, which can be fitted in the inner groove for cans with an outer diameter of 50 mm and in the outer groove for cans with an outer diameter of 60 mm. It seems that there are some exceptions, but it is compatible with most of the canned juices on the market. Since the cap has a spout, you can drink it while it is attached to the can.

The feeling of stability after mounting is quite good because it is mounted by pushing it in tightly. If you inadvertently knock down the can, the beverage inside will not leak out immediately. However, since it is not a sealing stopper, it seems NG to leave it horizontally. Also, when using it for cans of carbonated drinks, the cap may come off if it is subjected to strong vibration or placed in a hot place.
A cap for canned beverages that helps prevent dust from getting on the mouth of the can and stores the can that is being drunk in the refrigerator. How about using it for a drink at home, BBQ, picnic, etc.? I bought it from Amazon.co.jp and the price was 432 yen.