Be aware that some hemostat agent bandages use chitose, a sugar obtained from crab shells, and there is a lot of iodine in the distillate. Anyone with a "seafood" allergy (aka iodine allergy) can be put into shock by one of those bandages. Also, know that it's the one that works the fastest, because it causes the artery wall to constrict, AS WELL as making the blood "thicker" around the wound to promote clotting.
Another major hemostat bandage substance tends to cause alkaline burns around the wound. But again, it works.
"Quick-clot" brand uses kaolin powder to sop up as much water from the blood as possible, causing the remaining parts of the blood (cells, clotting factor, lipids, dissolved solids, etc) to form a matrix that clots rather quickly, but not as fast as the other two.
Front-line medics in Iraq carried all three types, and all three types were in "combat lifesaver" bags.
In addition to bandage material with rapid clotting agents, also obtain the "Combat Application Tourniquet." It works extremely well, and can be applied very rapidly (in under 30 seconds if you're wise and take it out of it's packaging when you first get it) even 1-handed if half of your arm got chopped off.
The C-A-T is designed to be easily sized for application to either the thigh or the arm (above the elbow), with no additional time needed for either use. (Do NOT apply a tourniquet at any point on an arm below the elbow -- all you'll do is fracture the ulna or radius, the ends cutting into muscle and possibly the artery running between those two bones, but either way causing more bleeding. Same goes for applying a tourniquet to the leg below the knee... you'll fracture the tibia and fibula before you stop the bleeding.