This is Topeak's largest MTX Trunk bag and features a new process that marries rigid moulded panels with flexible 600 denier fabric to make this the stiffest, most weather resistant MTX bag yet.600 Denier Polyester Dupont Teflon Coating for superb weather resistanceExpandable, divided main compartment with two side panniersRear water bottle holderInsulated main compartmentPadded foam walls protect loadElastic top bungees3M reflective strip for safetyBuilt-in carrying handle, plus detachable shoulder strapMounting: QuickTrack mount for MTX racksSafety light clipDimensions: 36x25x21.5-29cmCapacity: 22.6L1.160gThe expandable main compartment with two side panniers gives you plenty of storage space which makes this bag ideal for light mountain touring, road touring and commuting. The foam walls provide padding and insulation for use as a cooler or camera bag whilst the extra thick rigid foam sides, top and bottom makes sure your items stay well protected. Other features include elastic top