I found/evolved a pretty compact first aid kit, for anyone who's interested in something that's a reasonable tradeoff between space and utility:
It's an off-the-shelf kit from Lifeline, available at Fred Meyers, but modified by me as follows:
Buy Lifeline First Aid Kit (Fred Meyers).
Get a handful of zip sandwich bags.
Get a QuikClot Sport 50g (REI).
Get single use antibiotic packets (REI).
Get single use hydrocortisone packets (REI).
Get single use iodine prep pads (REI).
Get a 1 oz tube of SPF 40 sunscreen (REI).
Get some drugs.
Get an energy bar.
Get some foam ear plugs.
Toss the following Lifeline components:
scissors (that's assuming that you carry a knife or Leatherman)
warning sheet
whistle
"carabiner"
the band aid boxes (keep the band aids)
Remove half of the:
small band aids
medium band aids
butterfly closures
alcohol prep pads
benzalkonium prep pads
...and put 'em in your home medicine cabinet.
Sort all remaining band aids into a zip bag.
Sort all remaining gauze pads into a zip bag, along with the roll of gauze and the roll of tape.
Sort all remaining prep pads into a zip bag. Add 2 each of antibiotic packets, hydrocortisone cream, iodine prep pads (REI).
Roll up some TP, without the tube, and put it in a zip bag.
Put a dozen Q-tips in a zip bag.
Put 6 Aleve, 3 Benadryl, a couple Excedrin, and a couple Tylenol with codeine (or other prescription-strength pain killers) in a zip bag.
Put a small tube of sunscreen (REI) in a zip bag.
Put 4 foam earplugs in a zip bag.
Put the bag of gauze pads in the right side of the Lifeline kit. Stuff the triangle bandage, gloves, and a ballpoint pen behind it. Add your favorite energy bar.
Put everything else but the QuikClot and the TP in the left side.
Sandwich the QuikClot and the TP between the halves, and zip that sucker closed.