How PlatyPreserve works.
1. Pour wine into PlatyPreserve
2. Place cap loosely on PlatyPreserve
3. Remove all air by squeezing PlatyPreserve
4. Tight cap to seal out air in PlatyPrerserve
Since PlatyPreserve is a flexible container, the air can be removed from the wine by simply squeezing the container to expel ALL of the air. This can not be done with a rigid glass container.