Duct tape has been scored. (See journal entry of March 9). Not called cinta aislante, as a Spanish friend thought it might be (isolating tape -- narrower, it turns out, than duct tape, available in several possible colors, none of which are duct-tape silver) -- the clerk who sold it to me called it called it cinta americana: American tape. Thank god we're known for something besides heavy-handed foreign policy and films big into explosives/car chases.
So there you have it. Found it just in time, too -- an important seam was coming undone on my monster wheeled duffel. This means it will survive the coming Atlantic crossings.