Vacuum chamber pouches from UltraSource guarantee to extend the life of your product with exceptional optical quality (clarity, high gloss) and a consistent seal every time. Stronger, thicker seals eliminate product loss, freezer burn, and dehydration while providing extra protection during transport and handling. High-clarity transparent Poly/nylon material makes product easily identifiable through the seal. Compatible with small and large vacuum chamber machines. NOT INTENDED FOR FOOD SAVER SEALERS.
Had to up the thickness of the bags I was using in my CHAMBER style vacuum sealer from 3 mil to this 5 mil (the thickest I could find) when trying to package some extra coarse grain Himalayan sea salt. The 3 mil (0.003" thickness) SEEMED like it was working, but the next day the seals on nearly all packaged bags were lost due to numerous minute punctures from the sharp corners on the large salt chunks (5-8 mm or larger).
Great for smoked salmon! ! year and still fresh!
They could be very good bags, but I gave them a 1 because they would not work with my weston sealer. Should be more clear on what they will work with.