Keep your load as light as possible. Watch out for "just in case" items. After a few trips decide what is a luxury item that you're willing to carry.
For the weight, you can't beat a smart phone. Even with a backup battery, usefulness to weight ratio is high. I use mine as a gps, as a camera, and when I have service I use it to get weather forecasts. It's also a backup light, and, get this...... it makes a wonderful communication device!!! LOL (where I usually hike I have about 75% cell coverage).
I only carry redundant items that apply to safety. Two ways to start a fire, two navigation methods, etc.
Hike your own hike!
one or more gifts or other benefits from the co-op.