I use Canon E1 handstraps on both of my bodies, and they're great, but they require a battery grip to attach. The new Canon E2 strap comes with a lug for the tripod socket, but that would mean detaching the BR lug. If you use the Arca-Swiss system, some camera plates/L-brackets have the slot for a handstrap, and a 1/4"-20 hole for the BR lug (although I have my FasterR-3 attached to a Kirk 1" clamp that I then attach to a camera or lens plate as needed.