Jace,

Overall I think that you've done a very thorough job with this. The following are some quick thoughts I had:

You might find that the 3.5g indivual-use Water-Gel packets are more convenient to use (and maintain sterility) than a single 4oz container.

I assume that you're planning to have more than one (20mL) eyewash? Do you also plan to have a sterile eyewash cup?

A 60cc irrigation syringe is quite large. You may wish to consider downsizing this somewhat.

I second the suggestion to add a Sawyer extractor and a CPR mask. I would also consider adding the following items:

1% Hydrocortisone (Anti-Itch Cream)
Calamine/Diphenhydramine (Poison Ivy Relief - Ivarest, etc.)
DEET Insect Repellent (although this may be stored elsewhere)
Twezers / Tick Remover (forceps are not ideal for removing splinters or ticks)
Acetaminophen and/or Aspirin
Electrolyte tablets
Petroleum jelly (chapped lips, cracked skin, etc.)
Thermometer(s) (Look into the 3M Nexcare disposables)
Super glue (works well as a temporary suture)
Moleskin/Molefoam/Blist-O-Ban (blister prevention)

Finaly, a pen/pencil and small notebook would be quite useful, as would a hands-free light source (such as a small headlight). You may also wish to include a basic or wilderness first aid guide.

The last (and often overlooked) item would be a contents list showing the initial quantities and replenish levels.

Jim