On a slightly different topic, I have noticed while skiing several US resorts that a lot of patrol wear vests but not backpacks. How much gear to they actually carry with them in a vest? I assume that if they are the first at an accident scene, they make an assessment and then call for a toboggan with more first aid equipment or a patrol stationed at a patrol hut with a well equipped back pack. This could delay treatment as opposed to skiing with a well equipped backpack at all times.
Where I work the "trauma packs" and advanced airway management packs weigh close to 40 pounds and have things like AEDs, saline, IV starter kits, oxygen, advanced airways and ventilation bags, ventilators, nebulizers with Albuterol and Ipitroprium, dressings, burn materials, extensive meds, large splints, and suction units. It wouldn't be effective for all patrollers to carry all that in a pack all the time. The packs are positioned where they can be delivered to anywhere on the mountain in less than 10 minutes, and we keep patrollers standing by with them at the shacks at all times. Also large bone splints, backboards, and other large supplies and rescue equipment.
In my vest, as well as the others where I work (though a couple carry this in a small pack), we carry things judged to provide immediate on-scene lifesaving measures - airway, bleeding, circulation - simple airways (OPAs, NPAs), CPR blob masks, nitrile gloves, glucose, other meds (from aspirin and epinephrine to narcotics), trauma shears, abdominal pads, gauze, Kerlix, bio-occlusive dressings, biohazard bags, tape, flashlight, triangle cravats, gauze pads, band-aids, Celox, tourniquet, stethoscope, a tampon, tongue depressors, eye pads, wipes. medical guide, space blanket, whistle, forms, maps, pliers, pens, lighter, zip ties, fence wire, flagging, radio, 150 ft of 7mm climbing rope, 12 ft of 1" tubular webbing, slings, prusiks, a descender/belay device, some carabiners, climbing harness, beacon and some stuff I've probably forgotten like my cheater glasses.
It's not just medical response, we have avy, chair evacuation, and cliff responses. My vest weighs over 15 pounds, and life-saving treatment is the first priority. Is there something missing that you think would be valuable and effective to carry? For airways, it's impractical to carry advanced airways (Kings/LMAs), bag ventilators, O2, and suction with us. For bleeding, we carry enough supplies to last until the trauma pack gets there. For circulation, we have BLS/ALS CPR and we aren't going to carry AEDs. And we carry meds for immediate issues like MIs, Anaphylaxis, and overdose.
Vests can be easier to manage - they don't get caught on chairlifts, the pockets are quickly accessed, the load is more evenly distributed, they don't get in the way as much when you're working, and they don't slide down the hill because you take them off and set them down.
Edit: The rope and stuff is for rappelling out of a broken down chairlift to work on evacuation, or rapping down a cliff to stabilize someone stuck midway.