Very important that whatever first aid kit you get has a tourniquet, or that you buy one separately.
They are easily the most important life saving device in any first aid kit. 99% of the time you won't need it for normal cuts but when you are dealing an injury that needs one you WILL regret not having one.
Yep I have that problem now. All the toilet seats in my house are soft close and I slam public toilet seats whenever I'm out of the house now without thinking