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Here is what I have in my backpacking medical satchel:
Blisters
>three large blister pads
>three small blister pads with "wings"
>small roll of blister tape
Bandages
>2-in. roll of self-sticking bandage
>2-in. roll of cloth bandage
>one triangle bandage
>five packs of gauze rolls
>several each of several sizes of Band-Aids >two butterfly wound closures
Bandage Accessories
>small pair of light bandage shears
>several bandage clips
>several safety pins
>small roll of medical tape
Ointments/Topicals
>several foil-sealed prep pads
>blood clotting spray canister
>antibiotic ointment
>hydrocortisone cream
Medications/Supplements
>acetaminophen
>Imodium
>potassium capsules
>Emergen-C
Trauma
>compact aluminum splint
>proper tourniquet
>cold compress
Miscellaneous
>rubber squeeze bulb for flushing wounds
>thermometer
>tweezers
>nitrile gloves
>wad of cotton batting
>several Q-Tips
>tiny first aid manual
>two chemical light sticks
Related (but stored elsewhere)
>bug spray
>sunscreen
I omit antihistamine because I have no known allergies, am immune to poison oak, ivy, and sumac, and have only mild swelling at worst from bee and hornet stings. Wasp stings cause more substantial swelling but no other symptoms. I don't carry epinephrine for similar reasons, also it's expensive and bulky in any form. If you're deathly allergic, it's on you to carry your own.
No doubt I forgot to list something, this was all from memory.