• 箱はこ入いり — boxed (item)
• 重箱じゅうばこ — multi-tiered (food) box
• 手て箱ばこ — small container
• 箱はこ船ぶね — box-shaped boat

箱 is composed of the radical 竹 (bamboo) and the phonetic component 相 (shou/sou). It originally referred to bamboo-made containers. Today, it's used for all kinds of boxes, including lunch boxes, storage, and packaging.

重じゅう箱ばこにお弁当べんとうを入いれました。
I put lunch in a stacked bento box.

この箱はこは プレゼントです。
This box is a present.