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You wouldn't believe how much can be improvised in a critical first aid situation. A plastic bag (if you have 5p) and sticky tape (Duck) to seal a punctured lung etc. If someone is bleeding their last it doesn't matter one jot if what you grab is not sterile at the time.It is loss and shock will kill for sure.
If you ever became a casualty and visited Frenchay hospital,. Bristol you may be surprised who is behind the surgical mask and scrubs. Some of our pals from Bradbury Lines or perhaps the Queens personal protection officer.
We carried an array of firearms,smoke grenades etc but were forbidden to have scissors in our very comprehensive First Aid boxes (H&S :-)