Think situationally - what could happen on your hike up the PCT. Aside from the usual - trots, sunburn, bugs etc (carry appropriate meds and precautions) -

First aid self-administered - blisters, twisted ankle, broken ankle, cuts, scratches. Wraps, duct tape, knuckle bandages, and I like a roll of waterproof tape besides. For blisters I recently used 2nd Skin for the first time, its really good stuff, worth the weight and replaces moleskin. Depending on how far your PCT sections are, carry enough to bandage yourself for that duration, resupply when you use your FAK.

First aid for others - you encounter another hiker, whose heart has stopped. CPR barrier? CPR is next to useless in a wilderness setting. Drop it. Activate your PLB to initiate a SAR body recovery, pitch camp, and pray for his spirit to join the great march to the heavens, which are all around him at that point. Help is coming then.

- you encounter another hiker who has taken a fall down the trail. Bleeding, unconscious, possible head trauma, but breathing. What do you need? More than a 4x4 and alcohol swabs, pack a roll or two of kerlix to wrap her wound(s), treat shock with warmth by putting them in a sleeping bag, etc, hit the button on your PLB and/or go or send for more help.

Are you worried about bee stings and allergic reactions ranging up to anaphalaxis ? I am, at least when I'm hiking with Scouts. I carry a primatene mist inhaler + benadryl to attempt to treat severe anaphalaxis, and any Scout with a confirmed allergy must carry an epipen or better yet a Twinject (two doses), their trail buddy must know where its packed, and how to use it.

And so on like that. Cover what you know you can treat, cover what you might conceivably expect. That should determine your FAK and weight if you ask me. Last I checked I'm currently sitting at ~23 oz for all hikes and outings.

NOLS (nols.edu) puts together some pretty good minimal FAKs and components, you can review and build your own, or buy from them. Everything is a bit of a compromise up a trail on a long hike, but I really like things like their green soap pads and their irrigation syringe (too small according to some, but for cleaning wounds on the trail it works). Steri-strips and the adhesive are the bees knees for gaping wounds, you have the training for those.

A gallon freezer bag really does work, should hold it all.

And in case you haven't got one yet, **don't forget a PLB for when the stuff hits the fan.** This doesn't count as your FAK weight. 10 oz of preparedness right there. If you can't justify the weight, think of all the other crap in your pack that cannot signal for you own or someone else's rescue within 24-36 hours, and toss some of that.