The Best Litter Box Liners

The best litter box liners are thick enough that claws and scoops do not punch through, long enough to fold over the rim of your pan, and quick to close up when it is time for a full litter change. Our top pick is the Jonny Cat Heavy Duty Jumbo liner: a 2 mil drawstring bag sized for most standard open pans, with far more owner ratings than anything else in this group.

A liner does not replace daily scooping. What it does is catch the urine that seeps to the bottom of the box, so a full change means lifting out one bag instead of scraping a crust off the plastic. The right cat litter liners depend on the size of your box, how hard your cat digs, and whether you want fragrance at all.

This guide is general product information, not veterinary advice. If your cat’s litter box habits change, such as straining, going outside the box, or producing much more or less urine than usual, contact your veterinarian.

How We Picked

We started with liners on Amazon that have at least 50 owner ratings and an average of 4.0 stars or higher. We then compared published specifications: bag dimensions, thickness in mils, closure type, how the bags separate, scent, and count per pack. The order weighs owner ratings and rating volume alongside how well each liner fits common litter box setups.

How to Choose Litter Box Liners

Measure the Box, Not Just the Floor

A liner has to cover the floor, climb both walls, and fold over the rim. A quick check: add the box’s length to twice its depth. The liner’s long side should be longer than that, with room left to tuck under the rim. A liner that only just covers the floor slides down the first time your cat digs.

Most liners here are jumbo bags around 36 inches long: Jonny Cat (3 ft x 18 in), PawLyfe (36 x 18 in), PETOCAT and ondware (36 x 19 in), and Zomisia (37 x 18 in). CHEFNENO is the longest at 39 x 17 inches. The Fresh Step bag on our list is the smaller 2.5 ft x 17 in size for large pans; Fresh Step also sells a larger jumbo size. Fresh Kitty lists a fit for boxes up to 18 x 20 x 7 inches.

Oversize causes problems too. In a small pan, extra plastic bunches into folds where urine can pool and clumps can stick. If you are still choosing a box, our best litter boxes guide lists dimensions for each pick, and our litter box guides cover covered, high-sided, and senior-friendly designs.

Thickness and Diggers

Thickness is listed in mils (thousandths of an inch). Most picks here are 2 mil, including Jonny Cat, PETOCAT, Zomisia, KropBom, and CHEFNENO. Ondware lists 3 mil, and PawLyfe lists 4 mil, the thickest on this list.

If your cat digs to the bottom of the box or scratches the walls after every visit, start with the 3 or 4 mil options. A cat that shreds even thick liners is a good sign to skip liners and pick a box that is easy to wash instead.

Clumping Litter and Scooping

Clumps that form against the bottom of the box can stick to the plastic, and a sharp scoop dragged along the floor is a common way liners get torn. Scoop by lifting rather than scraping. A deep metal scoop with a smooth edge helps; see our best cat litter scoops.

Keep a few inches of litter in the box so clumps form in the litter, not on the plastic. PETOCAT and Fresh Step both tell you to add litter as usual on top of the liner.

Drawstring, Ties, and How Bags Come Apart

A drawstring lets you cinch the bag around the old litter and lift it out without touching it. Every liner on this list uses a drawstring except Fresh Kitty, which comes with separate ties.

Check how the bags separate. PETOCAT bags come separate, and both KropBom packs are pre-separated, so you never tear a bag off a roll. Zomisia uses perforated edges.

Scented or Unscented Litter Liners

Fresh Step and Fresh Kitty are scented; the rest are unscented. Many cats are put off by strong fragrance near the box, and a cat that starts going elsewhere after a switch is telling you something. If your cat is picky, or you already use a scented litter, choose an unscented liner and handle odor with scooping and litter choice.

Covered, Open, and Automatic Boxes

In a covered box, the liner goes in the base only. Jonny Cat says its liner is designed for traditional open-style pans; Zomisia lists open, flip-up, drawer, and high-back trays, and the KropBom 40-count lists open and hooded pans.

Self-cleaning boxes are different: the bag lines the waste drawer, not the litter bed. The KropBom 66-count is made for that job and lists models such as the PetPivot, but not the Litter-Robot 3, 4, or 5. Check your model against the maker’s list before buying. Our PetPivot review and best self-cleaning litter boxes cover those machines.

Multi-Cat Homes and Pack Size

With two or three cats, you change litter more often and the full bag is heavier. PETOCAT says its liner holds about 20 lb of litter and KropBom says its 40-count holds up to 40 lb. Pack sizes run from 7 bags (Fresh Step) and 15 (Jonny Cat) up to 40 (KropBom) for standard pans.

Buy a small pack first to confirm the fit in your box, then stock up. A liner that does not fit is wasted no matter how many come in the box.

Who Should Look Elsewhere

If you own a Litter-Robot, use the waste drawer liners the maker specifies; the KropBom automatic bags here are not designed for it. If your cat tears through every liner, a sifting litter box or a stainless steel litter box that rinses clean may suit you better.

For travel or a short-term setup, a disposable litter box skips the liner altogether. And if smell is the real problem, a liner will not fix it alone; start with our litter boxes for odor control.

Why You Should Trust Us

IndoorCatLab reviews gear for indoor cats independently. We do not conduct our own product trials; our picks draw on published specifications, independent reviews, and Amazon owner ratings, which also set each product’s ICL Score.

The ICL Score converts each product’s average Amazon owner rating to one 0 to 10 scale. Our ranking also weighs size, thickness, closure, and pack size, so the order of the list is not the same as sorting by score. We may earn a commission from qualifying purchases, but that never affects a product’s ranking or score. Read the full method in How We Review.

Final Thoughts

Best Overall: Jonny Cat Heavy Duty Jumbo Liners are 2 mil, unscented drawstring bags at 3 ft x 18 in, sized for most traditional open pans. They have by far the most owner ratings of any liner here.

Best Scented Liner: Fresh Step Drawstring Liners add a light fresh scent and a drawstring in a 2.5 ft x 17 in bag made for large oval and rectangular pans. Skip them if your cat avoids fragrance.

Best Extra-Thick Liner: PawLyfe Jumbo Liners are 4 mil, the thickest on our list, at 36 x 18 in. They suit diggers and oversized or multi-cat boxes.

Best Bulk Pack: KropBom 40-Count Liners give you 40 pre-separated 2 mil drawstring bags at 36 x 16 in for medium and large pans, open or hooded.

Best for Automatic Litter Boxes: KropBom Automatic Litter Box Bags are cut for the waste drawers of many open-top self-cleaning boxes, with a drawstring and a double-layer sealed bottom per the maker. They are not designed for the Litter-Robot 3, 4, or 5.

Frequently Asked Questions

Are litter box liners worth it?

For many owners, yes: a full litter change becomes lifting out one bag instead of scraping the pan. They are less useful if your cat digs through them, and you still need to scoop daily and wash the box from time to time.

How do I keep my cat from tearing the litter box liner?

Choose a thicker liner (3 or 4 mil), keep a few inches of litter in the box, and lift clumps rather than scraping the floor with the scoop. Fold the liner well over the rim so it does not shift when your cat digs.

What size cat litter box liner do I need?

Add your box’s length to twice its depth; the liner should be longer than that so it can fold over the rim. Most standard and large pans take a jumbo liner around 36 inches long.

Can you use cat litter liners in a self-cleaning litter box?

Not in the litter bed. Self-cleaning boxes use bags in the waste drawer, and fit varies by model. Use the bags your box maker specifies or a drawer bag that lists your model.

How often should I change the litter liner?

Change it whenever you do a full litter change, and right away if it tears or leaks. Scoop as usual in between.

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