Compact design rear rack mounting bag with large expanding main compartment and side panniers for commuting errands and touring expanding capacity main compartment with two side panniers and a multifunction top pocket aerodynamic rigid foam walls 600 denier polyester with dupont teflon coating 3m reflective strip built in carrying handle and shoulder strap safety light clip elastic top bungees 31x205x16 25cm 755g capacity 731 litre445ci