outer box; outer case; slipcase
Refers to the outermost container of a product, such as a cardboard box, slipcase, or protective casing. Often used for packaging of electronics, books, or collectibles.
The outer box of this figure is slightly damaged.
When I opened the outer box, the main unit and manual were inside.
ケース is a general loanword for case or cover, often smaller or more fitted than 外箱, which implies a box-like outer packaging.
Standard kanji spelling for outer box or case.
Alternate kanji spelling using 函 (box); less common than 外箱.
Compound of 外 (そと, outside) and 箱 (はこ, box), with rendaku voicing of はこ to ばこ. The alternate kanji 函 also means box.