Kirkland Signature Review

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

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.

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.

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.

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 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 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.

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.

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?