Drop chances

ItemStage 10Stage 50Stage 100Avg count
Paper18%18%18%0.38
Scrap Polymers18%18%18%0.37
Cloth Fragment18%18%18%0.37
Sewing Kit12%12%12%0.12
Bandage12%12%12%0.12
Vitamins11%11%11%0.11
Painkillers10%10%10%0.11
Aloe Cream9.1%9.1%9.1%0.09
Steroids8.8%8.8%8.8%0.09
The Fireman's Almanac Vol 67.5%7.5%7.5%0.07
The Fireman's Almanac Vol 47.4%7.4%7.4%0.07
The Fireman's Almanac Vol 37.2%7.2%7.2%0.07
The Fireman's Almanac Vol 27.1%7.1%7.1%0.07
The Fireman's Almanac Vol 57.1%7.1%7.1%0.07
The Fireman's Almanac Vol 77.0%7.0%7.0%0.07
First Aid Bandage7.0%7.0%7.0%0.07
Blood Bag7.0%7.0%7.0%0.07
The Fireman's Almanac Vol 16.8%6.8%6.8%0.07
Jar of Honey3.7%3.7%3.7%0.04
Splint3.7%3.7%3.7%0.04
Plaster Cast2.9%2.9%2.9%0.03
Wrench2.6%2.6%2.6%0.03
Fort Bites1.7%1.7%1.7%0.02
First Aid Kit1.6%1.6%1.6%0.02
Recog1.5%1.5%1.5%0.02
Iron Shovel1.1%1.1%1.1%0.01
Iron Fireaxe0.96%0.96%0.96%0.01
Herbal Antibiotics0.76%0.76%0.76%0.01
modMeleeFiremansAxeMod0.29%0.29%0.29%0
Antibiotics0.09%0.09%0.09%0

Average count per open at loot stage 50. From 40,000 simulated opens per stage; perks that raise loot are not counted.