bagheera, I am holding my 5 qt., G.I. issue canteen as I type. Description, upper left hand corner of side with purification tab pocket reads;CANTEEN AND CARRIER COLLAPSIBLE ASSEMBLY FIVE QUART CAPACITY DLA 183-91-0-4818 8465-01-254-5759 Crown Purse Inc.There should be a removable brass mesh screen in spout and a three snap side access to bladder.On reverse side should be a large stitched instruction panel with a diagram of two hands holding spout with printed instructions. Knockoff or issue, there is something seriously wrong if you are tasting heavy plastic. Mine had a slight flavor which disappeared after a few rinsings with baking soda. To taste that strong means the material is dissolving or offgassing into the water.This can be a serious health threat.Plastics of unkown composition may contain heavy metal, chemical and even insecticide impurities. A true milspec 5c qt. may be viewed at www. MajorSurplusNSurvival.com <br><br>