Since I have grand schemes of hauling out to an approaching 4 day ride that involves 20 hours round trip of driving, my USRider is current, I'm pulling mats and assessing my trailer floor as well as tires thoroughly, and the medical kit needed to be updated for the year.
I bought a $25 3-boxes-in-1 fishing box from Sportsman's Warehouse, and spent about $150 on all the supplies for what ended up being 3 well stocked kits: one large one for my truck, 2 smaller, one each for the crew bag and trailer. I don't totally redo these kits every year by any means but what I had was on the tail end of a few years use and depleted, so here's my chance to show it started over from scratch. While these are technically human med kits, a lot of this stuff crosses over for horse use just as my horse use often gets utilized for us humans (patched my husband up with vetericyn and vet wrap not long ago!).
So What's In There?
*gauze pads and rolls
*band aids various sizes, waterproof
*cheapie ankle/knee/wrist braces in big kit
*Icy hot patches
*hydrocolloid adhesive pads
*contact lens cases
*contact lens solution/rewetting drops
Also good to haul:
(more!) vet wrap
Sanitary napkins for padding wounds
Instant ice/heat packs
Now that you're prepared, hopefully you won't need any of it!