Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: does it leak and is it durable?
Document: It is beautiful, but worthless as a flask if it leaks. The glass did not crack, but does leak around the edges.
I get so many compliments on this flask. It doesnt leak for me (i have had it for over a year) its nice that you can see how full (or empty!) its getting.
Small, stylish, and leak-proof, this little flask was a great buy. No complaints in either form or function; it has served me well.
Stainless steel 5oz flask with a screw on cap (there is no metal piece to always have the cap attached, so be careful not to lose it). The glass port hole seems sturdy, too. Doesn't leak.
Really delightful design and great for the cheapskates among us. Doesn't leak (and boy I've tried them) and feels very well made. Also made in America which is always good in my opinion.
Awesome looking flask. Love the window, love the design, love that it doesn't leak at all!! I may have to purchase a couple more as pre-filled backups to grab 'n go.It's a beauty.
I have gone to great lengths to make it leak and I can not. Worse case scenario this thing is one of the cheaper nice flasks I see on here. You really cannot go wrong.
I bought this flask as a Christmas present. My biggest concern based on reviews of other flasks was purchasing one that did not leak. Not only is this a very handsome flask, it definitely did not leak!I would highly recommend this flask. It will easily hold 5oz.
Ive had this flask for a few months and it worked great at the beginning but last week i noticed it was leaking from the sides of the glass. The glass isn't cracked or anything it looks like the glass has shifted a little bit to the side and its causing it to leak.Looks Great though!
My intention was to get myself a flask for my 21st, and after much searching I came across this one. The construction is sturdy and doesn't leak, it holds plenty (while all material about it says 4 oz, the bottom says 5 oz), and the design is classy. Looks great when filled with a good bourbon, and easily fits a steampunk theme.
Answer: Hi there, the flask does not leaks at all and it's very durable, made out ofstainlessl steel. You will not he disappointed.