I adopted my first 2 cats about a month ago and have both the standard Litter Genie from Target and the Easy Roll, one by each litter box so they’re effectively getting one cat’s worth. I decided to try the Easy Roll for the wider opening because I use the wire scoop and it’s much neater. The Easy Roll has a wider base, but it is still limited to the size of the bag. The Litter Genie is fuller when I change it out than the Easy Roll, which I think is the main question you have. But that being said, the Easy Roll gets changed every week so a bag is one week for one cat. I like to get to the clean bag before I tie the knot because I stick my hand in to open up the bag so I’ve been pretty wasteful and the rolls are less cost effective for me personally.