A carry-on pack/duffel with two layers of 840 denier ballistic nylon for most of the bag and two layers of 1680 denier ballistic nylon for the base. 

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Four Cobra Buckles let you compress the pack down tight.

 

The webbing that runs through the Cobra Frames is doubled up for extra durability. The binding from the shoulder strap winds through the Cobra frame so that there is no need to sew it on.