Unless you're expecting to get shot, gauze with clotting agent is wholly unnecessary. Stick with regular gauze and carry a tourniquet (or be proficient at making a makeshift one). I'm sure you can find TQs for far cheaper in another place. Any type of arterial bleed in a remote area will be far better served with a TQ than combat gauze. Any venous bleed should be easily manageable with regular gauze and direct pressure. A SAM splint is nice to have but can also generally be MacGyvered. The only real "need" for one would be as ankle support, which can also be done with an ACE wrap, cravat, or a shirt. ACE wraps are also great for pressure dressings-two in one! Generally, my first aid kit when hiking is a couple bandaids, ibuprofen, and my blister kits. What you want on top of that is based on your comfort level to create a janky makeshift appartus. Always bring a fixed blade knife.