I like 'Necks idea of packs with different things in them. Might have to drop one so it would be good to have your decicion made up. Rate them by order of importance.
Ammo
Food & water (see below)
Break down your medical bag.
Tools would have to be changed to a leatherman.
I have a knife made by Big D that has paracord wrapped around the sheath, a flint, some lader wood a smaller benchmade knife so that takes care of fire and shelter with a lean to fixed up with the para cord.
Your preference after that.
Another thing is to stay away from canned goods. Those packets of tuna or chicken stow better. Those, MRE's and rice. Water purification straws.
BigSig, if unlubricated condoms is your thing, more power to ya. Don't ask, Don't Tale. May need some medical supplies with them, just guessing.