OK. I'm old. I'm loosing my mind. where is the penalty in carrying 16 ounces of PB in a jar from the store vs. carrying 16 ounces of PB 1.15 or 1.5 ounces at a time? Hey? The 16 ounce jar will only weigh 16 ounces until it is opened. Which could easily be during the ride back to the trail.
The refillable squeeze tubes are good. Verify, in the summertime, that they don't ooze oil/grease from things like PB, butter, honey, etc. Anything that can get very runny in the heat needs to be tested and/or Ziplock bagged.
Bon apetite!
Wayne