Theres no vacuum between the inner and outer shell, its just dead air space which is the working theory behind insulating anything. Heat can not transfer between planes separated by dead air space such as a double pain window.
Don't know if it keeps longer. I've consumed all of it by then if not sooner. On a road trip it kept ice for at least 12 hours.
Yes, there are vacuums in the better containers. A vacuum insulates better than normal air pressure, and the better containers warranty the vacuum if it is lost.
Lmao, a total vacuum? Lmao OK. It's not a complete vacuum dude, I've seen much more robust vessels implode under 15" of vacuum. Maybe 1" which is a marginal marketing trick at best. And it doesn't exactly "insulate" better but it does change the dynamics of the thermal exchange via temperature versus pressure (or lack of pressure in this scenario). Thermal dynamics isn't hard if you wanna get into it. Just math on a pretty advanced level.
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Coleman has been building vacuum based thermos containers for many years.
http://www.austinkayak.com/blog/2014/06/science-behind-yeti/
I never said "complete vacuum". I said they are sealed under vacuum, which they are, and if you puncture one (that is still under vacuum), you'll hear it taking in air to equalize the pressure. What about the thermal dynamics do you want to discuss?
The only complete vacuum is space.
The Hydro Flask, which is what I ordered, has an "at-home test" for the vacuum. If the vacuum is gone, it'll fail the test, and you'll get a new one.
http://www.hydroflask.com/warranty/
http://www.hydroflask.com/warranty/
Lol, no. There is a full vacuum between YGers ears
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maybe i'm a little more sensitive than your normal pals, so quit sucking so hard
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