120 Pack Jumbo Cat Litter Bags 37x18 - Thick Leakproof Liners

Our review of these jumbo cat litter bags finds them best for multi-cat homes or anyone using extra-large or automatic litter boxes who wants a tougher, cleaner way to change litter. The single biggest reason to buy is the extra-thick, claw-resistant material that reduces tears and holds litter and waste securely during removal. The reinforced drawstring makes no-touch disposal straightforward, and the 37x18 in size fits many popular automatic and jumbo boxes, so these liners simplify cleanup without the frustration of frequent leaks or shredded bags.

Key Features

• 3MIL extra thick construction: The heavy-duty HDPE material (3MIL total, 1.5MIL per side) is 50% thicker than standard liners and resists tears from digging cats.
• Jumbo 37x18 in size: Sized for most extra-large and automatic litter boxes, it fits boxes with up to 36 in combined length and width for easier installation.
• Holds 8-10 gallons: Each liner carries a generous capacity that is useful for multi-cat households or for reducing how often liners must be changed.
• Secure drawstring closure: Reinforced drawstring handles let you lift, tie, and toss without touching waste, keeping hands clean and simplifying disposal.
• Leakproof and odor-locking: The thickened HDPE layer creates a liquid barrier to help prevent leaks and contain unpleasant smells between changes.
• Quality tested guarantee: Each liner is checked for durability and the brand offers a satisfaction guarantee if the product does not meet expectations.

Who It's For

These liners are ideal for owners of extra-large or automatic litter boxes like Modkat, Jonny Cat, and Litter Robot who need a heavier, more tear-resistant liner. Homes with two or more cats will appreciate the 8-10 gallon capacity and thicker material that reduce the frequency of changes and the risk of punctures during cleanup.

Shoppers who need oversized or specialty dimensions larger than 37x18 in should look elsewhere, since several users found this jumbo size still too small for some boxes. Single-cat households looking for lightweight, low-cost liners might also prefer thinner alternatives.

Pros & Cons

Pros

• Durable, claw-resistant material reduces tears and litter spills during disposal.
• Reinforced drawstring makes no-touch removal fast and more hygienic.
• Large capacity fits many extra-large and automatic litter boxes for less frequent changes.
• Thick HDPE layer helps lock odors and prevent liquid leaks.

Cons

• Some customers report the 37x18 in size is still too small for certain very large boxes.
• At 3MIL thickness, the liners are heavier than economy bags and may cost more per change.

Specifications

Brand	Frnoip
Pack size	120 bags (12 rolls)
Material thickness	3MIL total (1.5MIL per side)
Dimensions	37 x 18 in
Capacity	Holds 8-10 gallons
Closure	Reinforced drawstring

Our Verdict

For owners of extra-large and automatic litter boxes who need stronger, leak-resistant liners, these 37x18 in bags offer excellent value thanks to their extra-thick, claw-resistant construction and secure drawstring. They cut down on messy changes and contain odors effectively, though buyers with very large boxes should double-check dimensions before ordering.

Frequently Asked Questions

Will these fit automatic litter boxes like Litter Robot?
Yes, the 37x18 in jumbo size fits many automatic models and extra-large boxes with up to 36 in combined length and width.

Are the liners truly leakproof?
The thickened HDPE layer creates a liquid barrier to reduce leaks and lock odors, but timely changing (1-2 times weekly) is recommended to avoid ammonia buildup.

Do they resist tears from digging cats?
The 3MIL construction (1.5MIL per side) is designed to be claw-resistant and customers report improved durability compared with standard liners.