This special Flask is extremely healty. If you want to get rid of PET and Plastic Bottles these Flasks are just the thing you are looking for. Camping, Trekking, Vacationing, in the Office, in your Car or just exesizing, you can use this item almost anywhere.Before using it the first time, fill-up with boiling Water and let it sit for 2 hours. The lid will keep liqıuids from spilling but may leak a little.Aluminium inside and outside. 750ml.