In Depth Baby Product Reviews Led by a Pediatrician

Kirkland Signature Review

A high-performing diaper that works well and has a reasonable price, but isn't as eco-friendly as you might want
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Kirkland Signature Review
Credit: Abriah Wofford
Price:  $0 List
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Manufacturer:   Kirkland
By Juliet Spurrier, MD & Wendy Schmitz  ⋅  Jun 2, 2023
93
OVERALL
SCORE


RANKED
#2 of 18
  • Absorption - 45% 10.0
  • Leakage - 25% 9.0
  • Comfort - 20% 8.6
  • Durability - 10% 8.0

Our Verdict

It is hard to go wrong with this high-ranking traditional diaper. Not only is Kirkland Supreme above average in almost every metric, but they also eke out a high rank in our lineup of a poop-ton of contenders (pun intended). This diaper offers top performance for absorption and leak protection and still provides more consideration for health and the environment than previous Kirkland offerings. This diaper is elemental chlorine-free (ECF) and lacks lotion and fragrances. With a reasonable price lower than more well-known brands and fancy green diapers, the Signature is a diaper that appeals to most families who wants affordability without sacrificing functionality. This diaper is not as eco-friendly as much of the competition. We wish there were more transparency in production and more consideration for the Earth, like being totally chlorine free. However, we think Kirkland does what a diaper should do, does it well, and brings it all together in a durable and comfy package babies and parents will appreciate. Get the scoop on how it stands up to the competition in our review of the best disposable diapers.
REASONS TO BUY
Excellent absorption
Great leak protection
Comfortable
Durable
Inexpensive
REASONS TO AVOID
Not eco-friendly
Uses coloring/inks
Editor's Note: This Kirkland diaper review was updated on May 24, 2023, as a newly updated and tested diaper.

Compare to Similar Products

 
kirkland signature
This Product
Kirkland Signature
Awards Editors' Choice Award
Best Overall Disposable Diaper
Top Pick Award
Best Disposable Diaper in Stores
 Best Value Award
Best Budget-friendly Disposable Diaper
 
Price $0.27 List
$0.28 at Amazon
$0.35 List
$0.36 at Amazon
$0.33 List
$0.34 at Amazon
$0.31 List
$0.25 each at Amazon
$0.24 List
$0.21 each at Amazon
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Bottom Line Impressive performance and better health nods than you'd expect make this a budget-friendly diaper parents will loveWith great absorption and leak protection, this durable and comfy diaper is a reasonably priced option for most familiesGreat absorption and leak protection, but few nods for baby's skin or the environmentGood absorption and few leaks with a budget price that are easy to find, but no nods for eco-healthAn affordable diaper that holds up well and is comfortable to wear with better health and eco considerations than similar options
Rating Categories Kirkland Signature Hello Bello Premium Huggies Little Snug... Huggies Snug & Dry Mama Bear Gentle Touch
Absorption (45%)
10.0
8.7
8.7
8.0
6.3
Leakage (25%)
9.0
8.4
9.0
7.8
6.6
Comfort (20%)
8.6
7.4
7.9
7.5
6.6
Durability (10%)
8.0
9.0
7.0
7.0
9.0
Specs Kirkland Signature Hello Bello Premium Huggies Little Snug... Huggies Snug & Dry Mama Bear Gentle Touch
Type of Diaper Green/Traditional Traditional Green Traditional Traditional Traditional
Chlorine-Free ECF/TCF ECF TFC Not Listed Not Listed ECF
Fragrance-Free Yes Yes Yes No - Strong baby powder scent Yes
Biodegradable Not listed No Not listed Not listed Not listed
Contains SAP Yes Yes Yes Yes Yes
Miscellaneous Materials Details Made with Plant Based Materials (At least 23%+ by weight) TCF fluff pulp from sustainably managed forests, a high-performance Super Absorbent Polymer, polypropylene/polyethylene/polyester nonwoven fibers, plant-derived PLA nonwoven fiber, spandex strands, and an elastomeric fill Wood Pulp
Sodium Polyacrylate
Polypropylene
Polyethylene
Adhesives
Polyester
Polyrurethane elastics
Wood Pulp
Sodium Polyacrylate
Polypropylene
Polyethylene
Adhesives
Polyester
Polyrurethane elastics
Wetness Indicator Yes Yes Yes Yes Yes
Stretchable side wings Yes Yes Yes Yes Yes
Stretchable Back of Diaper Yes Yes Yes Yes Yes
Eco-Awards & Certifications Good Housekeeping ~ "2022 Parenting Awards"
New York Magazine ~ "Best Diaper Subscription"
ptpa.com ~ "winner"
Dye-Free Not listed, does have a print No "Printing inks are used to provide a decorative design. The colorants and pigments we use are evaluated to ensure they are safe and non-sensitizing." "Printing inks are used to provide a decorative design. The colorants and pigments we use are evaluated to ensure they are safe and non-sensitizing." Not listed, has a very minimal print on waistband
Lotion-Free Yes Yes Not Listed Not Listed Yes
Latex-Free Not listed Yes Not listed Not listed Yes

Our Analysis and Test Results

Costco is a wholesale, big-box retail store that owns the Kirkland brand name. This private label tries to offer quality options for a value price. The Kirkland Signature label encompasses about 20% of Costco products. The Kirkland label can be found on everything from diapers to dog food and almost everything in between.

Performance Comparison



kirkland signature - there is much to like about the kirkland traditional disposable...
There is much to like about the Kirkland traditional disposable diaper.
Credit: Abriah Wofford

Likes


There is so much more to like about this Kirkland option than the Supreme diaper we've tested in the past. In almost every metric, it earned points over past models, and it ended up being one of the highest-scoring disposable diapers we've ever tested.

kirkland signature - the absorption filter paper for the kirkland tests showed no...
The absorption filter paper for the Kirkland tests showed no moisture transfer indicating quick absorption of our mock urine that is locked away from the baby's skin.
Credit: Abriah Wofford

The Kirkland diaper earned a perfect score for absorption as it had almost no indication of moisture on the filter paper in testing.


Even after three rounds of tests, it continued to impress us in testing. Given the importance of absorption for the overall functionality of a diaper, these test results put it at the top of the pack.

Once absorption is complete, we use a filter test paper to see how well the diaper “locks in” the moisture to predict how much moisture is exposed to the baby's sensitive skin. Less green on the paper means less moisture on the baby's bum.
Credit: Abriah Wofford

kirkland signature - leak protection for the kirkland diaper is somewhat lower than the...
Leak protection for the Kirkland diaper is somewhat lower than the absorption test results, but it still fared well and the likelihood of leaks under normal circumstances is limited.
Credit: Genaveve Bradshaw

Our tests and research also indicate that protection from leaks is also good for this diaper. With one of the highest scores in the group, you can feel confident that the Kirkland brand diaper is going to prevent most leaks.


If it doesn't, it was likely overdue for a change, you are using the wrong size, or no diaper could contain the nightmare blowout you now face. It happens to everyone at some point. During testing, there was some runoff in the initial pour, with the majority of the liquid pooling and quickly absorbing in the center of the diaper. Some of the drops splashed from the center and onto the outside of the absorbancy strip, and those droplets formed a small pool less than 1" wide.

kirkland signature - the materials on the inside of the kirkland diaper are very soft and...
The materials on the inside of the Kirkland diaper are very soft and skin-friendly.
Credit: Abriah Wofford

This diaper is a comfortable option that performed well during testing and our facility-wide survey for comfort comparison.


The main part of the diaper interior is remarkably soft compared to the competition, with testers being surprised a disposable diaper could be so soft and cloth-like. The back and legs are sufficiently stretchy with no coarseness felt and no overstretching that could cause pinches. Even the tabs are soft, with no rough edges or pokey parts.

kirkland signature - the new kirkland signature diapers proved to be significantly better...
The new Kirkland Signature diapers proved to be significantly better than the old Supreme diaper offered by Kirkland.
Credit: Abriah Wofford

Kirkland diapers don't use elemental chlorine in manufacturing, and they are free from many common irritants like lotion, natural rubber latex, and fragrance. While they could do more for considerations for the baby's health, like use no dyes or inks, they are still doing more than most traditional diapers and scored above average in this metric.

kirkland signature - the kirkland diaper is durable and we didn't experience any problems...
The Kirkland diaper is durable and we didn't experience any problems related to quality or durability during testing.
Credit: Abriah Wofford

Kirkland also impressed us with its design and materials creating a durable final product. We did not experience any faulty tabs or leaking SAP in our tests.


We also didn't have any problem with the back fabric breaking apart. In our online research, we also did not find many complaints related to diaper durability or quality.

kirkland signature - the kirkland signature diapers have some of the highest absorbency...
The Kirkland Signature diapers have some of the highest absorbency in the group and a lower price for those on a tight budget.
Credit: Abriah Wofford

Dislikes


While Kirkland has made some significant strides to make their diaper more eco-friendly, it still isn't on par with green diapers. For a traditional diaper, it does offer more than the average option, but more can still be done. This diaper is produced using an elemental chlorine-free process. It is free of rubber latex and includes at least 23% by-weight plant-based materials. They even offer a more transparent list of ingredients on their website than we've seen in the past. So this is both a like and dislike, but given the continued need for improvement, it is hard to rave about.

kirkland signature - the kirkland signature scored well in most metrics and high overall.
The Kirkland Signature scored well in most metrics and high overall.
Credit: Abriah Wofford

Should You Buy the Kirkland Signature?


This Kirkland diaper is a departure from past Kirkland options, with far more kudos to the environment and health metrics. It has perfect absorption test results, offers a lot for leak protection capabilities, and does it all for a wallet-friendly price that is easy enough to find. We love this diaper for what it offers and that they are doing more for eco-friendliness than ever before.

What Other Disposable Diaper Should You Consider?


Kirkland makes a great diaper, but if you want something more environmentally friendly or give more consideration to health, there are better options available. Parasol Clear and Dry is a high-absorbing diaper with similar functionality to the Kirkland. Still, it offers more for being eco-friendly and considers ingredients for babies with more transparency. However, it is also expensive, with one of the highest prices in this review. If you need a more budget-friendly choice, you can split the difference with Hello Bello Premium, which has higher scores for eco and health, great absorbency, and is easy to find at a reasonable price.

Juliet Spurrier, MD & Wendy Schmitz