The MTX TrunkBag uses a unique material process to give our largest, stiffest, and most weather resistant MTX series bag. In addition to the expandable top section and rear water bottle holder, the side panels expand to full panniers maximizing capacity. Compatible with all MTX QuickTrack™ racks with attachable side frames.MTX Side Frame are required for use on MTX TrunkBag with panniers.Capacity22.6 L / 1380 ci.Compartments1 Divided Main with Multi-stage Expandable Top,Two Side with Expandable Panniers.Material600 Denier Polyester.Max. LoadLimited to Rack Maximum Load Rating.InsulationMolded EVA foam.Bag AttachmentMTX QuickTrack™ with Attached Side Panels.Added FeaturesWater Bottle Holder,Shoulder Strap,Carrying Handle,3M™ Reflective Strip (* 3M™ is a registered trademark of 3M Company.),Safety Light Clip,Elastic Top Bungees,Optional Rain Cover.Size (L x W x H)36 x 25 x 21.5~29 cm / 14.1” x 9.8” x 8.5”~11.4”.Weight1160 g / 2.53 lbs.