This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
箄 combines 竹 (bamboo) with 卑, but the exact historical development and original meaning are uncertain.
The top 竹 suggests bamboo, and the bottom 卑 is a common phonetic component. Without a clear meaning, picture a bamboo basket or tool, as the kun reading かご hints at a basket.
For ハイ, imagine a bamboo basket being lifted high: high -> ハイ, and the basket is made of bamboo.