Andy wrote a review of Hydro Flask 64 oz. Wide-Mouth Water Bottle (Growler) on November 30, 2011
I was excited when my 64oz. Wide Mouth Hydro Flask arrived in the mail. The first thing I did was clean it out with water and vinegar like Hydro Flask recommends and then I put the cap on and turned it upside down and water started leaking out of the cap so I tightend the cap a little more and water was still leaking out. It appears the cap is made of plastic that is too soft for the job it is designed to do. I can actually bend the cap out of shape without using much force. I have a Klean Kanteen wide mouth water bottle and I took the cap off that bottle and screwed it on to my Hydro Flask Wide Mouth Water Bottle and it doesn't leak at all. The Klean Kanteen cap is made of much harder plastic and also has stainless steel inside the cap for strengh. When I poured hot water inside my Hydro Flask the outside of the flask never got hot and when I poured cold water inside it the outside never got cold so the actual bottle works well it's just the cap that dosen't work and I don't think a replacement cap would help because it is a design problem. Hydro Flask needs to re-design the cap to make it a better product.