gourd
匏 centers on a gourd, specifically a type of bottle gourd used as a container or utensil.
匏 combines 夸 (likely a phonetic component) with 包 (wrapping), suggesting a gourd that can be hollowed out and used as a container. The exact historical development is uncertain.
The left side 夸 looks like a big 大 person under a roof, and the right side 包 suggests wrapping or enclosing. Picture a large gourd being wrapped and hollowed out to make a bottle.
For ホ, imagine a hollow gourd used as a container: hollow -> ホ, and the gourd is hollow inside.