The walking kit in my truck is built on a Camelbak Rim Runner and can carry more than a kilo, but won't let me carry too much. It has a 100 oz bladder that I leave dry.

When needed I'll fill the pack and bladder from resources/water stored/rotated in the truck kit. Those bladders can get funky when wet. The things that are in the pack now (MSR Pocket Rocket, Ti & SS pots/cups, water filter et al) are part of the 96 hr system. What goes for a walk will be determined in the moment based on conditions and weather. I figure on a max of 15 pounds.