The 64 ounce Hydro Flask water bottle is a double walled vacuum insulated jug designed to keep heat or cold in and it does this very well. The bottle is lifetime warranted and very well made with an impressive coating that wears well. I covered mine with a 550 cord net bag I made as I knew the cap retention strap was not made for carrying four pounds of water. A biner hooked into the top of the net bag will allow it to be carried on your belt or a strap or pack.
I received this bottle last summer and started using it for iced water as the summers in Kansas can get somewhat warm at times and I like water handy. On a Sunday I filled the bottle with almost two trays of ice and topped it up with cold well water from my tap. I then put the bottle behind the seat of my car getting ready to go shoot on a friends range. Well in all the excitement I ended up forgetting about the bottle, there it sat for three days in high nineties temps in a closed up car. Remembering the flask after almost exactly three days I retrieved it expecting to find warm water, to my surprise when I took the cap off there was still ice in the water. Granted it was pea sized pieces of ice but it was ice none the less. That impressed me.
Next I took boiling water and preheated the flask with the lid on for fifteen minutes then I filled it with green tea at 330 in the morning. Heading to work I took the bottle with me, at 930 in the morning it was still to hot to drink. Waiting until noon I had several cups of tea and it was still hot. I was shocked many of the new big name brands will not keep things warm this long. At three in the afternoon it was still nicely warm, finally at 7 in the evening it was lukewarm. This flask kept a good heat for over 12 hours and warm for over 15. I was surprised and have no problems recommending this product.
The only drawback I see with this is you can not use it to boil water in a fire as it’s a double wall construction so it might not be the best choice for an os bag. I do use this flask every day and wouldn’t give it up! Be Ready and stay hydrated.
Length: 10.8 in.
Width: 4.7 in.
Weight: 1.7 lbs.
Colors: black, cobalt, graphite, mango, stainless
Material: double wall stainless steel
Capacity: 64 oz.