The VEER 18L pack is the first packable bag with an inflatable back panel. Packable Pocket & Top Organization Pocket Breathable Air Mesh Back Panel YKK Weather Resistant Zippers Air Mesh Shoulder Straps Expandable Waterbottle Pocket Lightweight Packable Materials Weather Resistant Materials Materials: Weather Resistant N100D Robic Dynatec and N210D Robic HD Oxford. Weather Resistant Zippers. VEER Packable Bag Dimensions: 18"H X 11"W X 9"D Volume: 18L Weight: 14.6oz (414 grams) Packed Bag Dimensions: 6"H X 9"W X 2"D