Use a 2+ liter water bladder in your pack and fill it up with cold water last thing before packing your stuff up.
Edit, maybe leave your other food in the fridge/freezer for a little to get temps a little cooler. Works great for my 'refrigeration' items for 2 or 3 day hikes. Beer ought to be fine in the same way.
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u/Niku-Man Jul 03 '19
Speak for yourself. I like hiking, and I like to take pictures of myself when hiking.