I thought Costco was just for parents, but my partner and I love it. Here are 12 things we buy on a typical trip.

My partner and I usually spend over $100 at Costco. Annabel Rocha

• My partner and I are dual income, no kids, so we shop at Costco for just adults.
• We love going to Costco for great deals on produce and sparkling water.

I never imagined I'd be shopping at Costco regularly. It seemed like a very "mom" thing to do.

After all, buying in bulk can help families save money — and, as some recent data suggests, more than half of Costco shoppers have children.

But ever since I got a Costco membership for my birthday in October, I haven't looked back.

I'm 30 years old, living with my partner in Chicago. I work from home as a journalist, and he's a service technician for a major beverage-dispensing company. Together, we make about $112,000 a year.

We're unmarried, and have decided not to have children — I guess you could call us DINKs (dual income, no kids). We don't set a strict budget for groceries, but buying food and other household items at Costco has saved us so much money.

Here's what we buy on a typical trip to Costco, which usually costs us about $140.