Larry found this at Walmart and there are plenty of this one way
valve compression bags available to use to make your gear smaller when you pack
it into your harness:

The ones he used can also be found on-line
here.

Larry Bunner <<lbunner>> writes:

They don't have the vacuum nozzle, they are hand rolled and work
great. Unfortunately I haven't found a pack with just the medium size which is
what I need for the Covert.