Small mystery container

Rummaging through old belongings just now and found this small round metal canister I picked up at an army surplus store back in high school. It has two separated sides each with their own metal screw caps. One side has “Чиш.” and the other side has “ол” (I thought they came from the Russian alphabet since these letters best match the inscriptions) unfortunately I can’t provide pictures on here, but if anyone has any ideas as to what this may have been used for or translations I’d love to hear!