Not exactly light weight but that is not something you usually look for in a gear duffel. The Clymb has Brooks Range Duffels for some nice prices. $38 small, $48 medium, l and xl unfortunately sold out. These are basically identical to TNF Base Camp Duffels but at a 60% or so discount. Smalls look to be the perfect size for airline carry-ons.
The rest of the Brooks Range gear looks interesting as well. Some pretty impressive weights if you can get past the plastic trash bag look of some of the fabrics.
If you are somehow unfamiliar with the clymb you need an invite to view the sales. I'm not going to post mine (especially since this isn't really an UL item) but you can type Clymb in the search box and should be a couple hundred results with invite links in them.
