It says theses sacks let eai out of the...
It says theses sacks let eai out of the sack, but do they allow air back in? I am in the army and am looking for a sac that will allow me to compress my army clothes so that they take up as little room as possible. Kind of like the vacuum bags you would use at home to minimize closet space but for the field.
The idea is that you squish air out, roll it up and clip it, and then there's no room for air to come back in. These are perfect for what you describe.