I Did the Math on Dog Poop Bags. The Bulk Box Saves Me 40 Dollars a Year.

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This is the most unglamorous topic in pet care, but it’s one I spend money on every single month, so I figured it deserved a proper analysis. Dog poop bags. You use 2 to 3 per walk, 2 to 3 walks per day, 365 days a year. That’s 1,500 to 3,000 bags per year for one dog. The cost adds up, and the difference between buying the small packs at the pet store and buying in bulk is bigger than you’d think.

I tracked my poop bag spending for three months (yes, I’m that person) and then tested four different bulk options. Here’s what I found.

The Math: Pet Store Packs vs. Bulk

Pet stores sell poop bags in packs of 120 for about 8 dollars. That’s 6.7 cents per bag. If you use 2,500 bags per year (averaging 7 per day across walks and yard cleanup), that’s 167 dollars per year.

Bulk boxes from Amazon sell 900 to 1,200 bags for 15 to 22 dollars. That’s 1.7 to 2.4 cents per bag. At 2,500 bags per year, that’s 42 to 60 dollars per year.

The difference: 100 to 125 dollars per year. For poop bags. That’s a year’s supply of dental chews or two months of joint supplements. All from buying the same product in a bigger box.

Gorilla Supply Poop Bags — The Ones I Buy Now

Gorilla Supply bags come in a box of 1,200 for about 19 dollars. That’s 1.6 cents per bag — the cheapest per-bag price I found. The bags are thicker than the pet store brand I was using, which means fewer tears and blowouts. Nothing is worse than a bag that breaks mid-use, and these haven’t torn on me once in 6 months.

They’re unscented, which I prefer. Scented bags just smell like fake lavender and poop, which is worse than plain poop. They fit standard leash dispensers, and the roll format makes them easy to grab one-handed while holding the leash with the other.

At 1,200 bags, a single box lasts me about 5 months. Two boxes per year, 38 dollars total. Done.

My take: Great price, good thickness, no tears. This is the bulk box to buy.

Earth Rated Biodegradable Bags — The Eco-Conscious Option

Earth Rated bags are marketed as biodegradable and are slightly more expensive at about 22 dollars for 900 bags (2.4 cents per bag). The bags are made with an additive that helps them break down faster in landfills compared to traditional plastic.

Here’s the honest truth about “biodegradable” poop bags: they don’t fully biodegrade in a landfill because landfills are anaerobic environments. They break down faster than traditional plastic but not as fast as the marketing implies. If you compost dog waste (which you can do with specific composting systems), biodegradable bags are a better choice. If you’re throwing them in the trash, the environmental benefit is marginal.

The bags themselves are good quality — slightly thinner than Gorilla Supply but still durable. I didn’t experience any tears. The lavender-scented version is available if you prefer that.

My take: Good bags if you want the most eco-friendly option available. Slightly more expensive but the quality is solid.

Pogi’s Poop Bags with Dispenser — Good Starter Kit

Pogi’s bags come with a dispenser that clips onto the leash, which is convenient if you don’t already have one. The dispenser is well-designed — you pull one bag out and the next one pops up ready to grab. No fumbling.

The bags themselves are decent — medium thickness, no tears in my testing, but noticeably thinner than the Gorilla Supply. A box of 900 costs about 18 dollars (2 cents per bag), which is competitive.

The included dispenser is the main selling point. If you don’t have a leash-clip dispenser, this kit is a good way to get one. If you already have one, just buy the Gorilla Supply refills.

My take: Good starter kit if you need a dispenser. Otherwise, stick with the cheaper Gorilla Supply refills.

Amazon Basics Poop Bags — The Generic Option

Amazon Basics bags are 15 dollars for 900 bags (1.7 cents per bag) — nearly identical in price to the Gorilla Supply. The quality is fine. I used them for a month without any tears.

The reason I switched to Gorilla Supply instead of sticking with these: the Amazon Basics bags have a stronger plastic smell out of the box. It fades after the box has been open for a few days, but the Gorilla Supply bags are odorless from the start. For something you’re holding inches from your nose, that matters.

My take: Fine bags at a fair price. If you already buy Amazon Basics, these work. I prefer the Gorilla Supply for the lack of plastic smell.

Features That Actually Matter (And Ones That Don’t)

Thickness: This is the only feature that truly matters. A bag that tears mid-use is a disaster. Look for bags labeled 15 microns or thicker. Most bulk bags are 12 to 15 microns, which is adequate. The premium bags at pet stores are often 18 to 20 microns, but you’re paying 3x more for slightly thicker plastic.

Dispenser compatibility: Standard rolls fit standard dispensers. If your dispenser takes rolls, any brand will work. If it takes cartridges (like some retractable leashes with built-in dispensers), you need to check compatibility.

Scent: Marketing nonsense. Scented bags don’t mask the smell — they add to it. Buy unscented.

Color: Doesn’t matter functionally, but dark-colored bags are more discreet. Blue and green are standard. Avoid clear bags, which defeat the purpose.

“Biodegradable” claim: Nice idea, limited real-world impact in landfills. Don’t pay more than 1 cent per bag extra for this feature.

The Annual Cost Comparison

Here’s what I was spending versus what I spend now:

• Before (pet store packs): 120 bags for 8 dollars, 21 purchases per year = 168 dollars
• After (Gorilla Supply bulk): 1,200 bags for 19 dollars, 2.1 purchases per year = 40 dollars
• Annual savings: 128 dollars

That 128 dollars buys my dog’s annual flea prevention. Or her joint supplements for four months. Or a new orthopedic bed every year. All from switching where I buy poop bags.

The bulk approach also means fewer trips to the pet store for a product I use every day. Two boxes per year, ordered online, delivered to my door. One less errand, one less thing to forget.

For more budget pet care tips, check our guide to food storage that saves money and our review of calming chews that actually work.

ThriftyPaw is reader-supported. As an Amazon Associate, I earn from qualifying purchases. That means if you buy through one of the links above, I get a small commission at no extra cost to you. I only recommend bags I’ve actually used on walks with my own dog.