I have arrived at my final solution to the litter box liners. I LOVE the formed paper liners and have found a brand that makes a "jumbo" size for the high sided tote litter box.
I now use the
Wonder Box size medium for the regular litter boxes and the
Nature's Miracle size jumbo for the high sided box. I also tried the medium size Nature's Miracle box but was not happy with it for a couple of reasons. It is even smaller than the WonderBox for one reason, and isn't as durable.
Though the Nature's Miracle product is not as long lasting as the WonderBox I have been unable to find the WonderBox in their jumbo size though their website does say they have one. Anyway, the description says it has a "fresh herbal scent" and I am not too keen on scented products, so it's just as well.
The medium WonderBox is a bit small but the cats seem to manage okay with it, and of course they have the high sided box for when they want to stand up and pee (SK and TC)
I place the liners in the litter boxes. Since the liners are a bit small, it actually works okay because the litter box catches overflow litter, then I can just lift out the liner and pour the litter back into it.
These paper litter box liners last a month or longer with no odor. I let one WonderBox go 7 weeks, just to test and it was only in the last week or so that I started to notice any odor and the paper started to tear up from the bottom a bit.
I keep track of what liner was started when. When a fresh liner is started, the litter from the old liner gets poured into the box with the next oldest liner and fresh litter is put in the new liner. (a method I copied from our own Lola) So I am not dumping out a ton of litter every week any more either. I have gone from one jug of clumping litter a week to one a month or less, a savings which more than pays for the liners!
I am very happy with the new litter box regimen. That dumping and scrubbing, and the smell of the plastic boxes was just getting to be too much for me. No more dumping and scrubbing, and no more smelly plastic, for me, ever!