As far as I am concerned whatever weight others carry, as long as they are having some fun, it isn't any of my business.
However if you want to use a label like "ultralite" you should be aware that it is generally considered to be up to 10 lbs for everything in your pack except food.
This is really only possible having a pack, a shelter and a sleeping bag at under 2 pounds each, closer to 1 each.
Mind you most use a mat too , ultaliters typically have a short solid foam mat.
Light is for a pack around 20 lbs or less, again everything except for food and water.
At around 30 lbs we get into the traditional weight category.
Of course one could have the big four at a pound each and still end up with 35lbs by having loads of "light" stuff in the pack.
Also depends on location and temperature range. Not easy to have a base weight of 10lbs at below freezing.

Franco