Liz,

Mine (the one that I gave you the link to) weighs 11 pounds all together. One box with the litter weighs 10 pounds.

I keep mine in the bathroom. I stack them differently then what they show on the directions. I put the sifter in between the two solid boxes (so the sifter doesn't get clogged). Then I pick up the full one and dump it into the sifter which is sitting inside the other solid box. Sift and dump the 'remnants' into the unclean box, them empty that into the toilet -- or in your case, the trash bag. I think if you lined both of the solid boxes with litter liners that you could just pull out the bag full of the 'remnants', tie it up and dispose of it.

Since I keep mine in the bathroom, I usually sit on the 'facility' to sift. So, I'm not picking up the 10 pounds very high or for very long.

Barb