At 1 Lb 5 oz per pair the Salomon MTN is a solidly constructed and super lightweight binding.
From Blister Gear Review:
"Keep it simple, stupid. That’s what Salomon and Atomic did with the MTN / Backland Tour binding. Coming in at the top of the test for ease of use, the MTN / Backland is a great choice for people who appreciate simplicity and want an uphill workhorse."