These bags are ideal for storage and low temperature “sous-vide” style cooking. They are rated for a temperature range of -58 F to 176 F, and have superb clarity.6 x 8 inch:Comes in acase of1000 6″ x 8″ bags. 3 mil thick.They can be used with chamber vacuum packaging machines8 x 12 inch:Comes in a case of 1000 8″ x 12″ bags. 3 mil thick. They can be used with chamber vacuum packaging machines.12 x 16 inch:Comes in acase of500 12″ x 16″ bags. 3 mil thick.They can be used with chamber vacuum packaging machinesPlease note:This item does not qualify for free shipping.