Same problem here (Europe). Legally speaking, where I live concealed carry is practically prohibited. Therefore, transporting the firearm in the backpack would be the only option. That said, if my life is at stake, that wouldn’t bother me. My research has turned up the Helikon-Tex Numbat chest pack which is similar to the HPG pack, but more readily available (and cheaper) in Europe. It is unusual, though.
Some possibilities: Have some part of your food stash that doesn’t need heating (emergency rations, canned food) Use MREs (no personal experience, but from what I know they include a chemical heater) Assuming proper ventilation is possible: Tea candles for heating (such as are being used to keep food warm) Alcohol burner (e.g. Trangia stove) Gas stove for camping (using gas canisters) A white gas stove would also be possible, but would not recommend due to the fire risk if not handled carefully.
Excellent information. Having worked on my bags for years, I concur with pretty much everything here. Except for food. Your lists, and also the bug out bag sizes you recommend, are based on food for just one to two days. That may be fine for level 1 or 2, but in an SHTF scenario, if I have to run, chances are that a safe area will not be around the corner. Worst case I’m looking at a week-long hike, likely through woods and hills, and associated hardship. The last thing I want is to burn 3000 cal a day and not having anything to eat, with the prospect that shelves will be empty even when I get to relative safety. I plan on carrying food for a week (for a range of about 100 miles), and in its most compact form that means 8 lbs and 6 l of storage on top of everything you have listed. I’ve done extended hikes with 40 lbs and aim to keep overall level 3 weight below 50, which is 30% of my body weight. I’ve also done 3 day strenuous hikes without food. It can be done, but then we go from prepping to survival.
Check out the Platypus GravityWorks Carbon Element (good for 300 liters) or the Katadyn Carbon Cartridge (refillable, good for 200 liters or 6 months).