The TK pouch is presumably a tourniquet pouch, but it doesn't quite fit the North American Rescue CAT. It does however fit a RAT tourniquet, which is only useful on children and dogs where the application of a CAT is just not possible.
So you should have both on your medical kit, just know the RAT is situational. Well, now you have a pouch for that or other smaller-statured items. So there's that.
