While the Hydro Flask can keep things cold for 24 hours, it can only keep things piping hot for 12 hours – we don’t exactly think that that will be a problem for post people. For 12 hours on the trail, you can keep your coffee (or tea; we don’t discriminate) as hot as it was when you first poured it. The Hydro Flask will give you the perfect reward for those cold mornings, or when you need a little bit of caffeine after physical exertion. Check out the insulated pint here!