For years now, almost every quality mountain, cyclocross and gravel bike is equipped with tubeless ready rims, which mean that you don't need a heavy rubber rim strip over the tape anymore.
Tape, sealant and valves are all you need.
Serfas' Tubeless Yellow Rim Tape is as good as we have found. It is high quality and very light.
21mm width fits everything except fat bikes and one roll is long enough to setup two 26/27.5/700c/29r rims.