dear, sweet darcy,
what do you think about rails for other bags - the brain bag, the smart alec, and the synapse 19?
also, a brain cell with rails?
the rails would be on a different path than the annex clip attachment webbing, so that you could still fasten the brain cell to the annex clips. in the diagram below, A = webbing loop for annex clips, R = path for rails. the black rectangle at the bottom of the path for the rails = gatekeeper clips for the rails.