Specifications include, but are not limited to: Heavy duty pouch may be boiled, micro waved, frozen, holds many chemicals, used for their ionic cleanliness. Film: Clear Polyester - 4.50 Mil Thick Size (Inches): 4 x 6 - FL Oz.: 4 Case Pack: 24/100 - 2,400 Pouches MVTR: ASTM F-1249 g/100sq.in.24hrs 0.170 OXYGEN: ASTM D-3985 cc/100sq.in.24hrs. 7.470 Product Details Item Part Number: 500-24 Known Manufacturer: AMPAC; Heavy duty pouch may be boiled, micro waved, frozen and holds many chemicals. Used for their ionic cleanliness. Film: Clear Polyester - 4.50 Mil Thick Size (Inches): 8 x 9.5 - FL Oz.: 24 Case Pack: 24/50 1,200 Pouches MVTR: ASTM F-1249 g/100sq.in.24hrs 0.170 OXYGEN: ASTM 3985 cc/100sq.in.24hrs 7.470 Product Details Item Part Number: 503-24 Known Manufacturer: AMPAC