Sirui R-1204, available by special order from BandHphoto.com. 2.2# (I think?), supports 22# or something, tall enough to glass with while standing. Sirui also has another series of tripods that are near these specs, but more expensive. I think it’s the N-xxxx-sk line. Slik 634 is another option that’s really popular on this forum.
I got the bigger sized version of that R-1204 I mentioned, the R-2204, for a little thicker legs and weight to handle an 85mm spotter better. Weighs in at 2.9#.
If you don’t care about standing to glass then there are TONS of options that weigh less than 2.6# on the market. Using the filters on some photography websites will help you narrow down choices.