The Tightvac Storage System is a unique patented vacuum seal closure system, which allows moisture to escape, keeping your goods dry & oxygen free. Minivacs are a perfect pocket & purse size storage for vitamins, homeopathic remedies, herbs, prescription drugs, cosmetics, jewelry & any misc. small items. Great for travel. Tightvacs save you money and guarantee fresher for longer food storage than other typical containers on the market. The Tightvac"s easy to use system creates a vacuum seal simply by pushing the button on the lid as you close it/press again to open, simple! Use Tightvac storage containers to increase the shelf life of all your dry goods; coffee, tea, cereal, flour, bread, herbs, and spices. Use all of our products; Tightvacs, Coffeevacs, Everythingvacs & Vitavacs for a multitude of household storage purposes, from small to large, in a variety of colors & styles. Hand wash only.