Whole pouch is about the size of a large wallet. Not a lot to it. Good to have with you for minor cuts and scrapes, but that's about it. Certainly not going to help with any significant injuries. Probably better off building your own kit.
This emergency kit has all the basics you could want when travelling, especially with your family in the car. I haven't had a need for any items here yet, but judging by my past experience, these items will come in handy if I ever do need them. I do a lot of camping with my boys and having this kit in my car gives me peace of mind.