1.
assortment, variety pack, assorted box
A collection of various items packed together in one box or package, typically food items such as sweets, cookies, or fruits. Very common as gifts in Japanese culture.
Usage
詰め合わせ is extremely common in the context of gift-giving and shopping. Japanese gift culture relies heavily on boxed assortments of food items. The word comes from 詰める (to pack) and 合わせる (to combine), literally meaning items packed together. It most often refers to food, though gift sets of towels, detergent, or cosmetics are also called 詰め合わせ.