Pack-It Specter Cube by Eagle Creek
This water-resistant, lightweight cube will protect your belongings from travel-related hazards, like spills and sharp-objects, without weighing you down or compromising airline weight restrictions.
Volume: [packed] 13.5L (825cu in), [compressed] 7.4L (450cu in)
Dimensions: [packed] 14 x 10 x 4 in, [compressed] 14 x 10 x 1 in
Weight: 2 oz.
Water-resistant silnylon ripstop fabric
Available in blue, green, red, white
Also, check out the Specter Pack-It Half Cube