With the requirements you have listed it will be hard to fully fill them all with a single bag. Being that you want a 4 season bag that is relatively light to pull dual duty in the summer.
My 2 cents would be to get a 3 season bag somwere around the -7 rating to use in the summer. Then an over bag to add to it for winter use.
If you want the option of putting it directly on the ground (not sure why personally) I wouldn't bother looking at down bags. The potential for them to get damp and become a wet coffin is to great. Synthetic will allow you to keep some insulation even when damp. You will add a bit of bulk/weight but save a bit of money going synthetic.
All of the big brands (Marmot, Big Agnus, Western Mountaineering, ECT) are all good bags. I don't have much experience with military bags other than some surplus ones that were terrible (bulky, heavy, annoying to use/assemble, and uncomfortable).
Last edited by Jeron Kahyar; 07-18-2018 at 09:07 AM.
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