Years ago I purchased a saddle blanket pin from a horse & tack shop to attach things to my backpack. I think its identical to the one shown on this link Link to 4″ Saddle Blanket Pin. Its like a XXL safety pin – its 4″ long but much stronger and well made. I’ve continued to use it over the years for many things including as a keychain. Items attached to it are very secure, in that I’ve never had it come apart. A store called “Campmor” also used to carry one like the saddle blanket pin except it was made of brass and is a little smaller and I think was just called a blanket pin. I remember them being very inexpensive. I’ve always thought this was a neat gadget. Has anyone else ever used them relative to EDC?