I know, not really UL, but just weighed out gear for a cc tour (no camping). For our tandem team, everything = 25 lbs. That includes everything except the bare bike with cages, bottles, and pedals. We obviously save a little with 2 people and only one set of bike equipment and spares. A surprising amount of this is lights, batteries, cell, camera, chargers, spare tire, etc., IOW equipment that probably isn't necessary but increases our comfort with being out bike touring, never knowing for sure what's going to happen next. We're running 2 panniers on a Tubus SS rack. We don't particularly notice the windage of the panniers on the tandem. Different with a single bike.

Still, thought we did pretty well with keeping the weight down.