A Costco store Tony Webster / Flickr

When Costco customers see the red and black Kirkland Signature label, they know they’re going to get a good product at a great price. But they don’t always know who’s making it.

Store brand products like Kirkland are typically manufactured by third parties, not the store itself — and they've been steadily rising in both quality and consumer demand, according to Harvard Business Review.

They tend to be cheaper than their name brand counterparts, however in some cases, their behind-the-scenes suppliers may actually be famous retail titans themselves.

While plenty of the names behind Kirkland Signature products are public knowledge — some are printed right on the box — others remain a closely guarded secret. More than a few rumors have popped up from people claiming to be in the know.

We've done some sleuthing through Reddit threads, news reports, recalls and issues of the store magazine Costco Connection to verify the claims. From Costco coffee to hearing aids, there are plenty of Kirkland Signature products that boast of big brand origins.

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