Be able to put on the water bottle cage. Made of matte-black PU and enhanced EVA which offer hardness texture. 3D cold moulding. Water-proof, anti-pressure and good-looking. Be able to put tools, tyres, gloves, charging cables, keys, pumps, earplugs, and other similar things. Net bags inside makes stuffs organized. Materials: PU + EVA. Dimension: About 19*16*10.5cm. Water-proof