The blood leaking into the space in between the organs that Flatline mentioned is a huge issue with controlling bleeds in the pelvic or shoulder girdles. I've seen guys stuff hundreds of 4x4s into a pig and not stop the bleeding (almost two of these because they weren't on the bleed. Maybe little sponges will work better than z-folded combat gauze (which is the standard right now). But it takes serious third party testing to validate that. Manufacturers claims don't mean much in most cases. They're in the business of making money. Of course they claim their product is the tops.