Most bounce houses, also known as inflatable bounce castles or bouncy castles, typically have two holes for safety and functionality:

1 Inflation Hole: One of the holes is the main inflation hole. This is where a blower or air pump is attached to inflate the bounce house. This hole is usually larger and has a secure closure mechanism to keep the air inside the inflatable structure. Without this hole, you wouldn't be able to inflate the bounce house, and it wouldn't be bouncy.