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Dude, it'll tell ya from experience, you don't want to be in too thick a sleeping bag in the warmer months. I get cold at night but in Afghanistan, even in colder Temps in the mountains, I would get such sweaty pits and junk while sleeping in a mummy bag. We get issued a multi bag system which isn't too common on the civilian market, but I would go lighter and then use a thicker pad or extra blanket if still cold. Waking up with sweaty man parts can ruin a hunt (people or animal) real fast. Best option in warmer to mid months is always to layer up. Can also use jackets and socks if it drops down lower than you're expecting
Someone give me some insight on sleeping bags for someone with no experience in back country and I dont have a large budget. Lots of options out there.