Tack, plus the spares that save a day
Start with the tack he will compete in, checked over the night before — stitching on girth straps and stirrup leathers is where failures happen. Pack a spare girth, because a broken or suddenly-too-tight girth ends a day, and a spare lead rope and headcollar, because the travelling set gets tied, stood on and dropped in mud. Add a lunge line if you ever work him in hand, a schooling whip if your classes allow one in the warm-up, and any boots or bandages he wears to compete. Load tack where it cannot slide: a day show's worth of leather in a heap on the trailer floor arrives creased, dirty and occasionally chewed.
Water, hay and the pitch kit
Water is the item owners most regret skimping on. Fill a container from your home trough — many horses drink sparingly at shows simply because the water tastes different — and pack his own bucket rather than relying on shared showground troughs. Bring more hay than one net: a day show runs long, classes clash, and a horse with hay in front of him stands quietly while one without rehearses his complaints. For the pitch, pack a fork and a skip or bag for droppings; plenty of venues require you to clear your area, and a tidy pitch is also how you spot the nail or the lost shoe before it matters.
Care kit and first aid
The grooming box travels complete: body brush, mane and tail brush, hoof pick, hoof oil or dressing, plaiting kit if the class expects it, coat shine and a sponge with a small bucket for washing off sweat marks. Add a sweat rug or cooler for after work and a waterproof rug if the forecast is doubtful — a horse standing wet in a wind between classes loses condition for the next one. The first-aid kit needs only be sensible: wound dressing and bandage, animal-safe antiseptic, a thermometer you know how to use, tweezers, and your vet's number written inside the lid. Anything beyond basics is a vet call, not a trailer-side procedure.
Trailer and human logistics
A day show is also a vehicle trip, so pack for the trailer as well as the horse: a jack and wheel brace that actually fit the trailer, a checked spare tyre, a tow rope, basic tools, and a warning triangle. For the humans: entry confirmations, class times, cash or card for the inevitable extras, food and water for yourselves, and wet-weather gear for the person holding the horse. Pack in reverse order of need so the first things wanted at the ground — headcollar, water, haynet — come off first.
Paperwork rides in the cab
Venues can ask for vaccination proof at any point, and a sick or injured horse at a showground gets faster help when his history is at hand. His KinsLe Pet Passport keeps his records together in one portable packet in the cab, alongside the day's entry details, instead of scattered between home, the yard and last season's jacket pocket.