Funny you should ask that, one of our group took a major tumble after hitting a Bedouin’s sheep at high speed on a rather sporty descent last weekend. Since I had to use some of my stuff I have reviewed my first aid kit which now includes:
For my own safety:
Resuscitation shield
Latex gloves
For bleeds & cuts:
2 non-adherent dressings
Extra large adherent dressing
Assortment of plasters including butterfly plasters
Breaks (collar bones, etc):
Triangular bandage
Misc:
2 cleansing wipes
2 sachets antibiotic ointment
1 sachet burn gell (hot disc brakes – ouch)
Micropore tape
In case I forget in the heat of the moment:
St John’s resuscitation/CPR aide memoir.
All in a nylon pouch about 8 by 3 inches. Total weight, 100g.
I have never found a first aid kit on sale that contained just the right things I wanted. Or they come with extra things that are unnecessary, such as scissors. Buy a cheap one and then amend the contents to suit. And then hope you never need it.