You are checking out zazzle's Quantum Physics messenger bag section where you can find many styles, colors, and sizes of Quantum Physics messenger bags for men & women available for customization or ready to buy as is. Most bag orders ship in 24 hours. Made in the USA, Zazzle custom messenger bags are durable and printable in full color . There is no minimum order size and most messenger bags can be customized with your pictures and text. To see some of the other products available on zazzle.com, check out our main quantum physics page.