i Have two types of kits
one is a range kit for trauma ( IE shootings) these are US individual medical kits, I have added a few different personal items to these, everyone in my family and extended family has these who shoots
they are 6545-01-094-8412 they are small and compact
Individual Military Issue Case - 679753, First Aid Safety at Sportsman's Guide
the second kit is large
its a surplus german army kit this comes in a large metal box each family vehicle has one of these, funny thing the bandage packages are in german & english and they are made in the US. this kit was $24
both can be found at sportmans guide, what they lack can be pruchased at rite-aid/walgreens/ CVS
items like cold/heat packs, water purificatipn tables, cloting packs, etc
Cheaper than dirt has large varity of kits
Cheaper Than Dirt - America's Ultimate Shooting Sports Discounter
also the solider first aid manual can be obtained for $12 in there is basic first aid manual a must