also: さんぱこ · みはこ · さんばこ
noun
three boxes; three box-shaped things; three containers
Counter for boxes, cases, or box-like objects. The reading さんはこ is the most standard.
引っ越しの荷物は三箱だけだった。
The moving luggage was only three boxes.
このお菓子を三箱ください。
Please give me three boxes of these sweets.
Compound of 三 (three) and 箱 (box). The reading さんはこ is the regular on-kun combination; さんぱこ and さんばこ show voicing variations.