I'm weird... I use this for jogging. I bought a running vest and this flask perfectly fits inside the pocket. I drink water but people judge me like I'm drinking in public. I act like drunken master and they scatter in awkwardness.The Good:- Ultra light. The reason why I bought it.- Sturdy. Try bending this bad boy.- Thin. Easily fits in your pocket.- Tasteless when drinking waterThe Bad:- It stains very easily and it's difficult to remove it. Touching with oily fingers may be the culprit. (see the pictures)- Weird finger sensation when touching it, like I'm about to scratch a blackboard- Slow for the liquid to come out. I wish the mouth was bigger.Verdict:Best titanium flask for the price. Great craftsmanship. I would have preferred it to be covered with a thin layer of other type of material to prevent any stains. Overall, my fluffy plump cat approves this product, and so do I.