The 50 Lift bag offers a teardrop shape open bottom design with 50 lb (~23 kg) lift capacity. Made of durable nylon materials in a high visibility Orange color. There is an Over Pressure Valve (OPV) located at the top on the back of the bag to rapidly remove air when needed but also serves to eliminate accidental over-inflation during ascent from expansion. The open bottom design (without a baffle) will allow excess air to vent in the case of an uncontrolled ascent.