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Wound cleaning kit (with water syringe, bandages, steri-strips, ect,) BP cuff, Glucose monitor, pocket mask, moleskin, sam splint, gauze rolls/pads, superglue, antihistamines, ibuprofen, aspirin, Tube of glucose, vial of epi, sometimes I'll bring a break apart sled. Then again, I work wilderness rescue and medical, so It's a bit overkill.
Bring what you know how to use, and make sure you know how to use it. Make sure it is appropriate for the environment in question. Vet tape is a good and cheap alternative to coband. Get training if you can. Remember that if shit gets bad you can improvise with other equipment.