The Tightvac Storage System is a unique patented vacuum seal closure system, which allows moisture to escape, keeping your goods dry & oxygen free. The 12 oz. Tightvac is the perfect size storage for coffee, tea, cookies, snacks, pet treats, sugar, oatmeal, cereal and any other dry good items. Great for travel & camping. Tightvacs save you money and guarantee fresher for longer food storage. 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. 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.