I like the Whelen sling and 1907 sling, and have used them to good effect.
For truly lightweight applications I had slings with sewn loops built by a place online, then I affix them to the rifle swivel studs with 550 cord. Eliminates a little weight and the noise of swivels and the clunking of a sling adjuster doohickey. Took a little experimentation to get the length right for a sling that was correct for packing but also worked to use as a hasty sling for shooting. This measurement could be different depending on the stock (length between studs), so using a little longer 550 cord attachments works to adjust the overall length.
