A standard military bottle fits snugly in this mug and both items fit easily in a standard bottle bag. The lid also fits very well. I've used the mug for both field coffee and bug juice, the mug didn't impart a metallic taste. Easy to clean by rinsing or with a damp cloth. I haven't used a mug over a flame before, so I can't comment directly on that. However, the quality of the mug seems to be holding up well.
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