These disposable bags are good for cushioning wine when transporting it in a suitcase. They're probably airtight, although thankfully I never had to find out if that was the case. They seal just like a postal envelope and remove the strip showing the adhesive to seal the package securely. I believe they can be *reusable* if you are careful to remove the filling and protect them when not in use. However, I wouldn't count on it. I've been to Sonoma and Napa California recently and a lot of wineries were selling them at the register. I bought some because the employees swore by them. However, I have another bottle transport bag (jet bag) that can be reused if the bottle doesn't leak as it has an inner material that can hold a whole bottle of liquid. These wine bags are actually more of a cushion and hopefully a retention system in case they break. The seal must of course be complete. I recommend them for transporting bottles in suitcases or for packing wine when moving house. Basically, it's bubble wrap in the shape of a bottle. Debbie Lee Wesselman
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