If you look at the specs pages only the PAKDRY1500 and the PAKDRY7500 are listed for vacuum sealing. Even their main page on the Mylar bags mentions pin holing. And none of the specs pages for the bags listed in the promotion page list using a vacuum, including the thicker PAKVF4W.
Always check the specs.
http://sorbentsystems.com/specs/pakvf4w.html
PAKVF4W
This lamination of film foil and polyethylene has a wide range of uses where a high barrier film is needed with a low WVTR. It is ideal for packaging of hygroscopic items and products susceptible to corrosion, and in food or medical device packaging, where very low oxygen levels are required.
Notice no mention of vacuum sealing.
http://sorbentsystems.com/mylar.html
"To compare the properties of MylarFoil, review the specifications for PAKVF4 which has a complete layer ( .00035 ) of aluminum foil with a metallized structure like PAKVF2.5M. An aluminum foil layer actils like a FLEXIBLE can providing the best possible barrier properties. Our PAKVF4PC structure has a .0005 foil layer structure that is 6.0 mils thick.
The majority of foil structures use only .00028, a thickness rife with pinhole problems."
http://sorbentsystems.com/specs/pakdry1500.html
PAKDRY1500 features an incredible 38-pound puncture resistance, which not only provides superior drop test performance, but also is the
best choice for the vacuum packaging of trays, reels and tubes with sharp edges. Suitable for ANY vacuum sealing system.
http://sorbentsystems.com/specs/pakdry7500.html
PAKDRY7500 is a 7.5 mil thick (minimum) high moisture and gas (oxygen, carbon dioxide et al) barrier film with a dual layer of both 48 gauge polyester and 60 gauge biaxially oriented nylon providing very high tensile strength and resistance to puncture, making this product
suitable for vacuum packaging applications
Here's the spec for what we'd normally be purchasing and notice
no mention of using a vacuum.
http://sorbentsystems.com/specs/pakvf4.html
PAKVF4
"This lamination of film foil and polyethylene has a wide range of uses where a high barrier film is needed with a low WVTR. It is ideal for packaging of hygroscopic items and products susceptible to corrosion, and in food or medical device packaging, where very low oxygen levels are required."
http://sorbentsystems.com/specs/pakvf35m.html
PAKVF3.5M
"PAKVF3.5M provides protection against moisture and corrosion for packaging of powders and food related products. It is also FDA approved."
http://sorbentsystems.com/specs/pakvf25.html
"PAKVF2.5M provides protection against moisture and corrosion for packaging powders and food related products. It is commonly recognized as the the flexible packaging material used in airline snack packets, prepacked ground coffee, and vitamin packets. It is also FDA approved."
Or as Sorbent themselves say at the bottom of every specs page;
"IMPAK CORPORATION
makes no warranty, expressed or implied, as to the suitability of these materials for any specific use. The values shown above were developed from random samples taken from production material. We believe them to be typical for the product. Actual values may vary somewhat from those depicted here. Customers should determine product suitability based upon their own internal criteria. "