Turns out No-Spill containers work well for chain oil too, but need to be vented. Half-inch hole, thread valve stem through with light wire, pop into place. Just got a MS2511T with tiny reservoirs, the thumb-press valve control makes it easy not to, you know, spill. The pair of containers packs well in the field kit.
I'll admit that I'm cut from said cloth, and can go on about it, when idling by a keyboard waiting for a stupid simulation to complete.