As a Scoutmaster in Bozeman, I learned to always Be Prepared! Scouts in the Troop always joked that I had any and everything that might be needed for a campout. Truth was, I always did.
Today, my truck is set up success and safety afield. My Drift boat is set up for safety afloat. Below the rowing seat is a sturdy and sealable dry box that is filled with anything that I can think of that may save the day. I am not talking about life vests and lunches. These fit into other storage areas.
My Drift Boat box contains a changing selection of other needs. Here are some ideas.
Toilet paper and sanitary wipes
Fire building materials
Compact but warm, compressed clothes
First aid essentials
Wire, asst. fix it gear and parts
Other needed stuff that may be necessary
You never know what may needed. On one trip, I had a client fall in, cut their hand, forget their glasses, break their reel holder, and needed to visit Mother Nature several times. After a strong headache was relieved, she offered to buy my day saving boat box! The good news was that she caught several huge trout in 3 species! That was her personal Best!