That "pocket grip" on the bottom is "prior art-ed" by old mountaineering equipment, as any climber or alpinist would be aware. ! [1] [1] The "pocket grip" is l

That "pocket grip" on the bottom is "prior art-ed" by old mountaineering equipment, as any climber or alpinist would be aware. ! [1] [1] The "pocket grip" is literally a pocket for grip sewn into the round cylyndrical shape of old sleeping bag stuff sacks (similar in shape to a bucket, but with a sinch lid). The purpose is exactly the same...to hold the bottom of the round cylender when you manipulate the open end. The only delta here is the soft textile is replaced with a hard-plastic and the pocket is molded not an actual pocket.