Hi guys, I was wondering if it would be safe to store those little Coleman propane bottles inside of a popup. I have 6 of them. Don't ask how I wound up with so many. The storage bag for my stove holds 2 and then I have 4 others. I will be getting my NTU popup soon and will be storing my stove in it (it doesn't have one). I know to store them upright, but not sure about the heat in the popup. Would it be better for me to have a friend make a box with a vent to secure to the tongue area and store and travel with them there? All of my tent camping gear is stored in my attic (I live in a small townhouse.) I keep the propane bottles on an outdoor storage shelf. I was storing them in my attic until I realized that my water heater was in the attic and although it is electric, it just made me nervous having both a water heater and propane bottles in the same area. Am I being too cautious and paranoid? Thanks for any advice.