Custom Printed T-Shirt Bags From produce and tools to books and hardware, these crisp bags are strong, attractive, and easy to carry. Lightweight high-density plastic resists punctures or tears. Gusseted sides give extra storage space for bulky items. Customize aT-Shirt Bag with your logo and marketing message. Custom Printed Thank You Bags and custom grocery bags plastic are most commonly made with strong white high-density film. However, you can specify low density as an option if you desire. If custom printed bags aren't in your budget, try our in-stock preprinted "Thank You" bags.