I capture on something outside of my planner (which is a 5x8 Moleskine).
The Moleskine does not have provisions for Capture. I Capture into my UCT, which are 3x5 cards in a small leather Note Jotter-type case. I have used other capture tools, but none has worked as well.
This allows my planner to only contain the results of my thinking, not the raw data. Raw data is for my Inbox.