You may not need a first aid kit very often, but when you need one, you often really need it.
Luckily this happened while touring through a large city, and I was able to ride to an urgent care clinic. It took 21 stitches to close it up. It still takes supplies to stop the bleeding so you can get to to a medical facility. Vet Wrap is great stuff. Get it at your nearest farm supply store.
There is a mirror image scar from a gash on the shin side of my leg. This one happened where there was no medical facility readily available, it was smaller, and it was on the shin where there are no major tendons to damage; so we cleaned it, closed it with butterfly closures, wrapped it with "vet wrap" and continued riding. Both of these could have happened anywhere. Damn chainrings anyway!
I'd suggest adding a syringe to irrigate (clean) the wound, seri-strips or butterfly bandages to close the wound, a couple 4"x4" gauze pads and Vet Wrap to keep the wound clean. Also keeping one water bottle with just plain water in it is a good idea.
Full medical kit
Bee Sting kit, epi pen x 2
Antihistamine tablets
Tape
Vet wrap*, 2" & 4"
4-4X4
Bandaids
Anti diarrhea med
Antibiotics, 10 day, oral
Tylenol
Irrigaion syringe
Wound closure kit
Neosporin
Anti-fungal cream
Nitrile gloves
*
https://www.valleyvet.com/ct_detail....2-00b0d0204ae5