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.

Tech Specs:

Material:

70D Cordura 

Volume:

[XS] 720cu in (11.8L) ;[S] 854cu in (14L); [M] 1181cu in (19.4L); [L] 1750cu in (28.7L); [XL] 2332cu in (38.2L) 

Dimensions:

[XS] 5 x 7.25 x 20in (12.7 x 18.4 x 51cm); [S] 5.25 x 7.75 x 21in (13.3 x 19.7 x 53.3cm); [M] 6 x 8.75 x 22.5in (15.2 x 22.2 x 57.15cm); [L] 7 x 10 x 25in (17.8 x 25.4 x 63.5cm) ; [XL] 8 x 11 x 26.5 (20.3 x 27.9 x 67.3cm ) 

Weight:

1.9 oz average 

Recommended Use:

River trips 

Manufacturer Warranty:

Lifetime 

Country of Origin:

American Samoa