Bento Box TRZ Bento Box TRZ is a nylon box that sits on the top tube behind the stem. It attaches with 4 velcro straps, 2 around the stem and 2 around the top tube. The box is open at the top and has a mesh cover or a solid (rain) cover which attaches with a velcro strip. The mesh cover is adjustable and can conform to different shapes. The box is reinforced on four sides with thin plastic inserts. It is easily opened and closed with one hand. It weighs 2 oz. and comes in a variety of colors—Original Black, Royal Blue, Red, Yellow, Grey and Orange.