The perfect compact and lightweight kits are now available: the SOARescue Med Mag series. These kits are the same footprint as an AR-15 magazine, and easily fit into pouches designed to carry magazines. Incorporate a medical kit into existing kit without having to add the bulk of extra nylon or find some compact places where a low profile medical kit can hide and be ready for action. Coming in at a mere 7 oz, this kit won't weigh you down either. EDC the kit without bulk.
The Med Mag First Line (Hybrid) kit contains all the components you'd need to address the first few minutes of a major trauma patient in one compact spot:
Hyfin Twin Compact Chest Seal
4" Mini Trauma Dressing
1 pr Gloves