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Vacuum Plastic Packaging Bag for Hot Dog Packing. Vacuum Forming Suitability The bags are designed for vacuum packaging processes, helping achieve stable vacuum formation, uniform package appearance, and reliable closure. Reliable Sealing Structure CO-PACK can recommend top seals, side seals, bottom seals, or three-side seal structures according to equipment and product needs. A strong seal helps maintain vacuum state. Low-Temperature Flexibility The bags maintain flexibility at low temperatures, helping reduce the risk of cracking or seal failure during cold storage and transportation.