I don't know because its only used for ice water, not for flavored drinks, but the material does not appear to be The type that would retain flavor after being washed out with soap and water. I can say it is a well made and nice looking canteen and it keeps ice water cold for an entire day and does not leak if tipped over.
My son primarily used for water during football season. However, it washes very well and i think all "Flavors" will wash out and not leave an after taste.
While not completely sure if they are shatterproof, our 3 Grandkids all have these water bottles & used at all sports, And they are not gentle w/them. They have all held up for several years & still being used.
Yes! We have 2 that we use for our boys sports. It's always very hot outside when they head to practice and games. I fill it about halfway with ice, then add cold water and it stays nice and cold for hours, even in the hot summer sun.