Best Litter Tray Liners: Thickness and Size
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The best litter tray liners are the ones that fit your tray, carry a full load without tearing, and close with a drawstring you can tie in a few seconds. In the research set for this keyword, the liners are sold as jumbo bags sized around 36 by 18 inches, usually in packs of 20 to 50, and the listings describe their thickness in mils. Three liners are covered below, each from an Amazon listing. The specs were checked on the dates shown. Liners are a consumable, so compare the count and the cost per bag on the listing before you buy, and check the current price on Amazon.
Quick answer
- Measure your tray first. A liner that is too short will not reach the edges, and one that is too long will bunch up and tear at the corners.
- Thicker is not always better. The listings describe thickness from 2.5 to 4 mil, and a heavier film is harder to pull out with a full load.
- Choose a drawstring style if you want to lift the waste out in one move. All three picks describe a drawstring.
- Check the listing count against the bag count in the bullets. One pick lists a unit count that does not match its included components.
Sizing a liner for your tray
A liner works only when it reaches the walls of the tray and gives you enough slack to tie the drawstring. The picks in this group are all rectangular liners sold for standard or jumbo trays. The PawLyfe listing describes an 18 by 36 inch liner, the Dote on pet listing describes 36 by 18 inches, and the FortiCrest listing describes 37 by 18 inches. The Dote on pet listing also gives a fit rule: its liners are described as suitable for trays with a basin circumference up to 72 inches and a basin height up to 17 inches.
Measure the tray’s length, width, and depth, and compare them with the listing’s size. If your tray is a hooded or top-entry model, the listing does not always say whether the liner fits the hood, so check the tray’s own sizing before you buy.
Thickness and tear resistance
Thickness is the number most listings put in the title. The listings in this group describe 2.5 mil for the Dote on pet liners, 2.8 mil for the FortiCrest liners, and 4 mil for the PawLyfe liners. A mil is one-thousandth of an inch, so a 4 mil film is thicker than a 2.5 mil film. A thicker film is less likely to tear when a cat digs or when a heavy clump drops in.
The thicker film also makes the bag stiffer. A heavy, stiff liner can be harder to lift out of a tray, and it costs more per bag. Choose the thickness that fits your cat’s habits and your budget. The listings describe tear resistance as a feature, and we did not verify those claims, so treat them as the manufacturer’s statement.
Drawstrings, odor, and disposal
All three picks describe a drawstring, so you can gather the liner and tie it shut. The FortiCrest listing describes its liners as scent-free, and the Dote on pet and PawLyfe listings describe unscented liners. Scent-free film does not control odor by itself. It only avoids adding a scent. Odor control depends on how often you change the litter and how quickly waste leaves the box.
Check your local rules for disposing of cat waste in plastic bags. The listings do not give disposal guidance, so follow the rules where you live.
Our picks
1. PawLyfe Jumbo Cat Litter Box Liners, 4 Mil — best for heavy-duty tearing
Specs (from the listing, checked 2026-10-28): Liner size 36 by 18 inches; item dimensions 18 by 36 by 0.1 inches; item weight 4 pounds; capacity 15 gallons; material plastic; drawstring closure; unscented. The specs list a unit count of 1, while the included components list 20 jumbo bags, so confirm the count on the listing before you buy.
Pros (listing features): The listing describes a 4 mil thickness and says the liners are twice as thick as the competition. It describes the film as scratch and tear resistant, and says the bags stay in place during use. Cons and limits: The “twice as thick” claim is a comparison the listing makes, and it does not name the competitor or the method. The count conflict above is the main limit.
Best for: A large tray, a multi-cat home, or a cat that digs hard into the liner. Skip if: you need a liner that is easy to pull out with one hand, because a 4 mil film is stiffer than the others.
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2. Dote on pet Jumbo Litter Box Liners, 50 Count — best for a large supply
Specs (from the listing, checked 2026-10-28): 50 count; 36 by 18 inches; 2.5 mil high-density polyethylene; capacity 30 pounds; drawstring design; unscented; listed use cat litter. The listing says it suits trays with a basin circumference up to 72 inches and a basin height up to 17 inches.
Pros (listing features): The listing describes a sturdy drawstring design that lets you pull out the bag for a weekly change. It describes the film as resistant to tearing and lightweight. At 50 bags, it has the largest count of the three picks. Cons and limits: At 2.5 mil, it is the thinnest film in this set, so the listing’s tear-resistance claim is less robust than the 4 mil option. The listing does not state a weight rating for a full bag.
Best for: A single-cat home that changes litter weekly and wants a large supply. Skip if: you have a heavy-digging cat or a multi-cat home, because the thinner film may tear sooner.
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3. FortiCrest Cat Litter Box Liners, 30 Count — best middle thickness
Specs (from the listing, checked 2026-10-28): 30 count; 37 by 18 inches; 2.8 mil thickness as stated in the title and description; capacity 30 pounds; material plastic; item form roll; color green; unscented; the listing describes the liners as heavy-duty and tear-resistant.
Pros (listing features): The listing describes a 37 by 18 inch size, a 2.8 mil film, and a scent-free formula. It says the liners fit standard and larger trays, and it gives a 30-pound capacity. Cons and limits: The listing describes the thickness as measured, but it does not say how it was measured, and we did not verify it. The listing does not state a weight rating for a full bag in a larger tray.
Best for: Owners who want a middle thickness, a 37-inch length, and a 30-bag supply. Skip if: you need the drawstring to be the main closing method, because the listing describes a roll format and does not say how the drawstring is built.
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How we chose
We began with the research set for this keyword and kept liner listings that gave a size, a thickness, and a closing method. We then favored listings whose size and count matched their bullets, and we flagged the ones where the count did not match. The three picks cover three thicknesses and three counts, so the best choice depends on the size of your tray and how often you change the litter. The order is not a ranking.
What we could not verify
- Tear resistance and load capacity beyond what each listing states. None of the listings reports a standard test result.
- How the thickness figures were measured. The listings state them, and we did not check them against a manufacturer document.
- The PawLyfe count. The specs and included components do not agree on the number of bags.
- Whether any liner fits a specific hooded or top-entry tray. Check your tray’s size.
- Current prices and availability. Check the current price on Amazon.
Related reading on this site
If a liner is part of a larger cleanup plan, see our guide to litter box liners. For the tray itself, read cat litter boxes with high sides, since a taller tray can change how a liner sits.
Frequently asked questions
How thick should a litter tray liner be?
The listings in this set range from 2.5 mil to 4 mil. A thicker film is less likely to tear, but it is stiffer and costs more per bag. A 2.8 mil film is a reasonable middle choice for many trays.
Do drawstring liners work better than plain liners?
The drawstring lets you gather the bag and lift it out in one move, which is the main benefit the listings describe. A plain liner still works, but it can be harder to close without spilling.
Do scent-free liners control odor?
Scent-free liners do not add a fragrance, but they do not remove odor on their own. Odor depends on how often you change the litter and remove waste.
Will a liner fit a self-cleaning or hooded box?
The listings describe liners for standard and jumbo trays, and some list a basin size limit. They do not always say whether they fit a hooded or automatic tray. Check the tray’s own sizing before you buy.
When should I ask a veterinarian about litter box habits?
If your cat avoids the tray, strains, or changes how often it uses the box, talk to a veterinarian. A liner cannot fix a health problem, and this post does not give medical advice.
Bottom line
For a heavy-digging cat or a large tray, the PawLyfe 4 mil liner is the sturdiest choice on paper, once you confirm the count. For a single cat and a big supply, the Dote on pet 50-count pack is the simplest option. For a middle thickness at 37 inches, the FortiCrest 30-count pack is a good fit. Measure your tray and check the current price on Amazon before you buy.
Sources
- PawLyfe Jumbo Cat Litter Box Liners, 4 Mil, ASIN B09YVK6MY6, Amazon listing checked 2026-10-28: https://www.amazon.com/dp/B09YVK6MY6
- Dote on pet Jumbo Litter Box Liners, 50 Count, ASIN B0D45DM45D, Amazon listing checked 2026-10-28: https://www.amazon.com/dp/B0D45DM45D
- FortiCrest Cat Litter Box Liners, 30 Count, ASIN B0GJRV47VX, Amazon listing checked 2026-10-28: https://www.amazon.com/dp/B0GJRV47VX
