noun
cool box; cooler box; ice box
A portable insulated container for keeping food and drinks cold, often used for picnics, camping, or shopping.
ピクニックにクールボックスを持っていく。
I take a cool box to the picnic.
クールボックスに飲み物を入れて冷やしておく。
I put drinks in the cool box to keep them cold.