Thanks, guys.
Anyone have a favorite multi-tool? And should one endeavour to carry a chain tool, and if so, is a spare link required? In 20+ years (Jesus Cristo I can't believe I am that old...), I've broken two chains on MTBs - the first about 20km from the parking lot at Cooper's Rock State Forest, Henry Clay Furnace Road... I didn't have a chain tool there and had to stop three or four times to pound the chain back together with rocks found at trail-side, in the best tradition of Gunnar Shogren's life.
The other incident took place only a couple of miles from my house, on the local trails at South Park, to which I'd driven myself anyway. I met a hot equestrian chick on the walk back along a horse trail and we ended-up hooking up, rutting around like a couple of the deer that frequented the area. So it wasn't all bad - though I'm sure her horse was traumatized (or at least scandalized).
But apart from that, I've never broken a chain that I could then fix trail-side.
Happy New Year...