The Target Center allows bags that are 12" x 6" x 12" or smaller, which is roughly the size of a lunchbox. Anything larger than that, and you might be out of luck, my friend. But don't worry, you can always check your bag at the door, just like you would at a airport.
Now, you might be wondering, what about my water bottle or phone charger? Well, the good news is that you can still bring those in, as long as they're not in a prohibited bag. It's kinda like going to a music festival, where you gotta be mindful of what you bring in, but still have all the essentials.