Q: are these corks completely natural? i was thinking of using them as a cap for canteens, about how long would they last?
A: these are a natural cork material. the life span would depended on the wear and tear and the style of bottle their being used in.
Q: Which corks could I use for the growlers-clear glass, 2 qt. ?
A: You can use our #14 tapered corks ( 24-4214 ) for use in the 1/2 gallon growlers.