Being a Costco kind of guy, I buy a lot of Kirkland products…and why not? Kirkland stuff is usually good stuff and it's priced right and I can buy in bulk and stock up on necessities. I'm still living off the toilet paper I bought there before the pandemic.
There is, of course, no real Kirkland company that manufactures anything. Kirkland sells gas but has no oil fields. It sells canned tuna but has neither fishing boats nor canneries. They have other companies make up what they need and slap the Kirkland label on it. Sometimes, you also get the name of actual supplier but sometimes, the folks who make the Kirkland shoehorns don't want you to know of their involvement. They sell their shoehorns under their own brand for $6.00 each and would like it to be a secret that they also make identical shoehorns with the Kirkland label that Costco sells for three bucks.
Some of the fun of shopping at Costco is figuring out what's under the disguise. Here's an article that unmasks some of what you buy there.