Evacuate the air and keep your food fresher and longer with Evak glass storage containers by Prepara. Scientifically tested. The Evak locks in flavors longer and keeps contents fresher. Perfect for coffee, tea, cereal, dried fruits, granola, herbs, spices, confections, etc. The twin valve system automatically forces the air out as you push down the lid and allows you to easily pull up and remove the lid to access contents.