Perhaps following in the footsteps of another similar product, MiniAni have unleashed a plethora of pantsu meant to adorn water bottles, offering countless designs based after the quirky characters of Prison School and bound to sell well regardless of the product’s actual usefulness.

The various pantsu on sale, which will be capable of covering a 500ml bottle:

One pair will set buyers back ¥490 – the pantsu will be available soon.