WINBAG MAX, Larger than the original. The WINBAG MAX is a very powerful hand operated inflatable air cushion made of fiber reinforced material that will save you countless hours on the jobsite. It is designed to provide a maximum pressure of up to 550lbs/250kg and can be used in conjunction with shims and wedges in a wide variety of applications. The WINBAG MAX gives the user infinite adjusting possibilities; save time installing windows, positioning heavy doors and leveling furniture, kitchen cabinets and household appliances just to name a few practical uses.