Byrd_Huntr... I've not done anything scientific.. I retired from teaching about a 1 1/2 years ago where my car sat in the sun all day... and at the time threw out the food in my bag out without eating it... the car now spends most of the time in the garage... the tinned tuna I just rotated out was consumed without a problem, along with the ramen... I was trying a DIY retort pouches with water heated by the Swiss volcano stove on Sterno...I rotate the water quite regularly as I go thru about 3 bottles a match along with a couple of Gatorades, and shoot about 3 matches a month

for the retort pouch 24inch square aluminum foil, folded over, triple folded at the seams, two paper towels folded around around and placed in a 1 gal zip loc bag...about 4 minutes..used some with the mashed potatoes... a little bulky, but easier to manage than trying to add 1/2 tuna to 1/2 potato (and vice versa) and making two pouches in the original packets