3L umufuka-mu gasanduku ni ubwoko bwo gupakira bukoreshwa mumazi nka vino, amazi cyangwa ibindi binyobwa. Ubusanzwe igizwe numufuka wa plastiki wuzuye amazi hanyuma ugashyirwa mubikarito. Igikapu-mu-gasanduku gishushanya korohereza kubika no kugabura kuko kibika ibicuruzwa kandi muri rusange byoroshye kugikora. Ubu bwoko bwo gupakira bukoreshwa mubwinshi bwamazi kandi burazwi cyane munganda zikora divayi kubushobozi bwayo bwo kongera igihe cyibicuruzwa bimaze gufungurwa.