... heavy stuffs inside the bag,with the help of the tri-wheel QH-B-205 stair climbing shopping cartyou can easy ... heavy stuffs inside the bag,with the help of the tri-wheel1.Big capacity bag:about 35L.Enough space for kinds ... your keys,card,etc,little stuffs inside.3.high quanlity Tri-wheels:which can help you climb stairs,lift heavy goods ...