Costco is a huge conundrum when it comes to sustainability. The company itself is very admirable: workers are paid and treated well when compared to other stores like Walmart; the company attempts to buy local products; and the giant warehouse stores pass on savings to consumers. Wall Street continually complains about this very moral company that pays for most of its workers’ health insurance, will not mark up items just to meet some analyst’s sales projections and is pedantic about where it locates stores so that it will not cannibalize its sales.

Costco stores embraced skylights and solar before it became fashionable; it has long worked with its supply chain to change the shape of packaging to make shipments more efficient; and has long been a model of waste diversion, recycling all those cardboard boxes you see in its spartan yet sparkling clean stores.

And yet in some ways Costco is dripping in excess and waste. Some of the clamshell packaging is still impossible to open while hideously oversized. All those deals may sound amazing until you waste that amount of food you cannot eat. And while organic and healthful products are easy to find, you can also find plenty of eyebrow-raising goods from Roundup to the worst of processed foods.

Yet the company overall is an exemplar among companies within and outside of its industry. The company continues to innovate and source more responsible products while eliminating dubious ones. And it is possible to shop there and buy nutritious food products and responsibly manufactured goods. My recent monthly trip to Costco sums up the mixed feelings I have about a company I enormously respect. Traipsing through the store in Santa Cruz, I understand the success. After all, my heart wanted the Cheez-Its, Pop-Tarts and Pepperidge Farm Goldfish. But the brain loaded my cart with Greek yogurt, hemp seeds and soy breakfast patties. The brain also managed to spend way more than I had planned. Costco is a true shopping land mine indeed.

What the heart wants at Costco

What the brain demands you buy at Costco