Big Litter Pan with No Top?

Question
We have a rather large cat who has to duck to enter a covered litter pan (even a large covered pan) and a smaller cat who easily fits into any litter pan but who sometimes pees over the edge of the uncovered pans and rather widely rakes the litter so it flies all over the place if we don't use a covered litter pan. We were willing to let our larger 18-pound cat squeeze into the covered pans until recent events (some out of the box peeing and pooping which may or may not be connected to the size of the litter pan) led our vet to inform us he suggests NEVER using a covered pan. Instead, he recommended we make or purchase an uncovered pan with extra high walls. Can you tell me where I can buy one of these or exactly how I can make one? And do you agree with his position (as covered pans are readily sold in every pet store I've seen)? Thanks for whatever info/insights you can provide!

Answer
Hi Evan,

I don't know what his problem with a covered litter box is.  I have used them in the past, and I personally like them.  However, I have found what I think is the answer to your dilemna.  I use a large heavy duty plastic container that you can purchase at Walmart for around 5 or 6 bucks! It's NOT in the pet department, but in the area where they sell plastic containers.  It's deep so the litter doesn't fly out, its about the width and length of a regular litter box and it works great!  I think its made by Rubbermaid, but it doesn't really matter.  The  one I got came with a lid for storing things, I guess, but I just pitched the lid as I don't use it.   It's very easy to clean and I think you would be very happy using it.  I think it comes in blue or gray.  I love the one I use, and my cats have absolutely no problem getting in and out of it.
I hope this works for you!!

God Bless,
Becky