You can find a number of free patterns, low-cost commercial patterns, no-sew options, and step-by-step photo instructions online for shopping cart seat covers. Some of these covers can even double as a cover for a restaurant high chair, swing, and booster chair. If you have a particularly messy eater at restaurants, you can simply pull up the high chair cover, bundle it up, shake it out at home over a garbage can, and throw it into a washing machine. What is great about this cover is that it can fit any size shopping cart, including the oversized carts at wholesale stores like Costco, Sam’s Club, and BJs. The only downside, this pattern requires a lot of fabric, but the cost of the additional fabric is negligible when you consider how this cover can serve double duty. While this pattern isn’t free, it’s inexpensive and comes with additional add-ons like pockets and loops for adding toys. It also has instructions for a second leg hole set for seating two small children in a larger-sized cart that seats two.