Yup, 4x4's are my favorite for about 90% of anything bleeding. I prepackage a stack of them, maybe 1.5-2" thick, a roll of gauze of some type, a roll of tape (with a corner turned under for easy location) if the gauze is not the stick to itself stuff, and a pair of gloves in a ziploc bag. My car FAK has several of those things in it. When I was an EMT, I stopped more bleeding than I care to remember with that stuff...