But I will note: While there’s a small silicone tag that fits into the sip hole to seal it, it isn’t perfectly leakproof, meaning this isn’t a mug I would casually throw in my bag.

The SEAL Operative's Guide to Eluding Pursuers, Evading Capture, and Surviving Any Dangerous Situation, explains what to do if someone tries to mug you and how you can defend yourself if you need to.