My current bikepacking tent is a
Tarptent Double Rainbow which comes in at 1,252 grams (my measured weight). I carry it in a Sea to Summit 20 litre dry bag attached to my Revalate Designs Harness. I also have in the bag, my sleeping bag, sleeping mat, pillow and liner for the sleeping bag. It has worked out well for me so far.
You can see the setup here (yellow drybag upfront).
Barker Inlet - Day 2-07 by Aushiker, on Flickr