hey Muddycrick! Mtn Ops Yeti and Ammo have a 2 year shelf life if the seal is not cracked. Once it is cracked you are looking at 6 months as long as it is stored in a cool dry place and you are not getting moisture into the bottle. The expiration is found on the bottom of the bottle. If it is not there I would go off of the date of purchase. Let me know if you have any other questions about the products. - Casey Harbertson