A filler formed to fit underneath a bed frame is provided. The filler includes a membrane. The membrane may include a top layer, bottom layer, and a sidewall connecting the top layer and the bottom layer together. An internal pocket is formed within the membrane. The internal pocket is capable of receiving and retaining a gas, thereby making the membrane an inflatable membrane. A valve is secured to the membrane and forms a fluid connection from the internal pocket to an outside, allowing users to inflate and deflate the membrane.