Keith Ti9306 Grade 1 Pure Titanium Pocket Flask with Funnel - 4 fl oz

Edit: Feb 2023: Going on 3+ years now and the flask has held up like a champ from multiple canyoneering and camping endeavors. I've bought a few more for friends/family and none of them have had the weird thread problems that the second one I bought (and returned/replaced) did. I actually bought the larger version of this flask from the same vendor--same quality, just a bit bigger. Overall, still pretty happy with it! Overall seems really fantastic--volume is definitely off, but the exterior dimensions are all spot on (see attached images). 62.5g empty, 219g full of water, water dumped into measuring cup measures 156g. Seams are super clean both inside and out (see interior pic). And they thoughtfully dimpled the 4 corners at the bottom so it will stand upright whether empty or full (again, see pic). Not sure about the other reviewers--while it is certainly very light, it doesn't feel flimsy or "soda-can-like" at all--there is only a tiny amount of flex when pressing moderately in the middle. And it takes two full rotations of the cap from tight-to-off (not sure what the reviewer mentioning "one-half turn" is talking about; maybe he meant one-and-a-half?) The top of the cap has a clear liner to keep it airtight (probably silicone? didn't discolor or lose flex when boiled in water for a few minutes). Also, I haven't noticed any staining on the outside--of course, skin oils leave a residue, but it washes right off with any kind of soap. Definitely wouldn't put it through the dishwasher, though--those detergents are not great for raw metals, and you wouldn't really get any water flow inside anyway. The dimensions listed are accurate, except that it does bow out in the middle sides about 2mm (see pic; instead of stated 20mm depth, it's about 22mm in the center). And there weren't listed dimensions for the spout--but the cap is 14.5mm OD/12mm ID, and the spout is 11.6mm OD/10mm ID. It's 8.7mm from top of spout to body of flask. Don't have a thread gauge so I can't tell you the pitch of the threads, but they look smooth and clean. Funnel doesn't have a vent crease, so it's pretty slow to fill unless you hold it up a little to give the air a way to escape. Also, the funnel is small enough that you'll probably need to decant from whatever larger storage bottle you've got into something smaller like a measuring cup to be able to use the funnel without spillage. Titanium doesn't leave residue and is non-reactive. See picture of cask strength left in the flask for a week with no discoloration or flavor change. Overall seems like a pretty skookum flask. If it leaks or gives me trouble, I'll update this review. Edit: Bought a second one for a buddy; the lid didn't thread onto the flask very well at all. Returned/exchanged--replacement is as smooth as mine. QC needs a little work, I guess.

I love this flask. It is light, it looks cool and above all it works as it should. Will not have to worry about rust and it will make a great surface for my laser engraver.

Awesome flask. Very solid!!

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 water The 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.

The perfect size for carry-on for an flight or just carrying around inconspicuously. It’s light-weight, high quality, and I haven’t noticed any change in taste to scotch even after leaving it in there for weeks. Highly recommend.

this is a sweet flask. light, very functional, and nicely designed and thought out. It will even stand vertically. It really is a functional piece of art. One small recommendation.. the screw on top could use more threads. Nice flask Thanks!

While there are millions of flasks on sale, there are very few 100 ml models. If you are frequent flier and frequent drinker at the same time you know what i mean. Nice craftsmanship, good material (no metal after taste that is typical for low grade stainless steel flasks), lite (again if you fly you know what i mean). Cheers.

I was looking for a smaller Ti flask than my Snowpeak ~5oz and thought this was it. However, it actually has more capacity and is way over the stated 100ml capacity at ~160mls, and so for me, is redundant. Threads are also extremely shallow, with ~one half turn between tight and off. All that said it is inexpensive for Ti flask, does not leak, and feels of good quality, so I will keep it. Please correct the specs on this flask.

Great little pocket size flask very light great construction