I've had a fairly well-stocked bag of tricks, but am paring it down through attrition/expiration of items. Part of me still wants to have a few fluids and non-scheduled injectables for things other than trauma (e.g. nausea, dehydration, allergic reactions, altitude sickness, etc.), but the same question arises: what is the end point? One can go down the rabbit hole of building a mini ambulance, and my STOMP bag was encroaching on that territory with traction splints, advanced airway devices, a plan to get an O2 delivery system, etc. I could max my credit card and still never have enough stuff to deal with every eventuality. I could jump through the hoops to get higher scheduled injectables, but then need to comply with double locking and record keeping, etc.
Of all my medical bags & equipment, the big one got used once to numb up a neighbor's heel in the middle of the night while another physician friend removed a crochet hook. The CCRK Squad bag in my truck got used once, when I used the SAM Splint to stabilize my own broken leg for the ride to a hospital.
For example, this is only a portion of my airway roll. You can see a disposable laryngoscope blade, an endotracheal tube and nasal airway pulled out for the picture, and a King LTD behind that. Off to the left in green is the rack of different oral and nasal airways, endotracheal tubes, Magill forceps, etc. Not in the shot are the Melker cric kit, pulse oximetry, and a few other things. To be fair, airway's probably over represented because of my specialty, but the whole bag is not practical to carry far, and someone getting intubated in austere conditions is in dire shape.