Only my large bulk supplies FAK has a 4" wrap. The AMK Comprehensive Kit has a 3" elastic wrap and a SAM splint, but no 4" wrap. Really, most FAK's are designed to size/cost constraints much as JI is doing with her's, and you must make-do until better can be found.

Jeannette, you might like to check the inventory on the AMK Fundamentals kit as a point of departure -- add/trim/delete as required for your size/cost constraints.
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Better is the Enemy of Good Enough.
Okay, what’s your point??