Bags feature easy-zip closures for seal that is freezer and microwave safe (w/o vacuum seal). Liquid barrier included (in select sets) to help prevent liquids from being absorbed by pump. Suitable for sous vide cooking. Expert German engineering. Marinate in half the time. Keep food fresh up to 5 times longer and reduces food waste. All bags are BPA-free. Free app calculates how long the vacuum sealed food will remain fresh. App with reminder function for when food needs to be consumed. Includes: 8 Small bags. 18 Medium bags. 4 Large bags. Vacuum pump.