I'de say the new Mini is a slight improvement - 1 ounce
If you had female threads on the output, you could use it to backwash
With either the Squeeze or Mini, screw it on soda or water bottle, squeeze and there's a stream of water, point it at and fill your clean water bottle
If you screwed it into clean water bottle, it would create air pressure and quickly inhibit flow.
I went backpacking with some teenagers. They had a MSR filter. Screwed output onto Platypus bag. The Platypus bag exploded. Fortunately, they had extra bags (and extra saws, axes, stoves,...).