I use a sweetwater that I recently modified to lighten it up. I drilled out some of the handle etc., cut off some of the excess plastic on the bottom of the cartridge, and shortened the hoses. Comparing my modified filter to another unmodified one I can feel the difference in weight. You can also just get rid of accessories such as the bottle filler thing as you can just stick the hose into whatever container you use. I just use a platy anyway so it is pointless to carry the universal adapter.

It has also been a very reliable filter as I've had it since 97 or so with no issues. I will also use Aqua Mira depending on whether I wish to carry the filter or not.