I think there are a few threads on here somewhere but I am too lazy to search around.
I have been an EMT for 20 years and have carried various different packs - most often times too much.
I keep a pelican box (protects from the elements) stuffed full of just about everything that I need to get someone patched up. I have used it several times, once for a broken foot on the trail and several eye washes for dust etc...
Everything is kept in zip lock baggies with common items packed together (trauma/drugs/burn stuff etc...) I also write the exp date with a black sharpie so I can easily see when I need to replace something. I use the kit for offshore trips as well and will add in some stuff for neuro checks and jellyfish stings etc... I will keep oxygen and a bigger kit in the tow rig when it goes as well.
I keep the following in there at all times:
Paramedic pocket guide
trauma shears / forceps / scissors / tweezers / scalpel
Glucose checker and two tubes of insta-glucose
CPR Mask (it will accept a BVM)
Waterproof adhesive tape
Ace/elastic bandage (twisted ankles etc....)
4 rolls of kerlix
12 4x4s (sterile)
8 5x9s (sterile)
Assorted sizes of band aids
Sam splint <-- a must have for any kit IMO, they can be used in so many ways.
2 triangle bandage
BP cuff and stethoscope
Antibiotic ointment, hydrocortizone cream
note pad, pen and black sharpie (notepad and pen are waterproof)
burn jel (waterjel)
bio hazard bag (can be used for more than a bio trash bag)
Sting relief wipes (for bug bites)
I also keep some matches wrapped up in saran wrap in there just in case my treatment doesn't work and I have the need to dispose of the body... and it keeps the matches nice and dry at all times.
I will go snap a few pics...
So that is what I keep in that kit. I also have a c-collar handy and one of these cool little devices in case of a femur fracture:
I also have a "go bag" with rescue type stuff in it including a 4:1 in a bag and some extra pulleys, caribiners, gibbs ascenders and some rope. I can get a sked stretcher for bigger/longer trips if needed.