 Scan QR codes in the porta-potties for a chance to win prizes. Your local events update on 1310 KNOX. Brought to you by M&K Porta-Potties. Your local porta-potty poo-fessionals. White or wheat, classic or old-fashioned, with or without sesame seed. With so many choices, selecting the right bun for your perfectly grilled burgers, hot dogs, and brats can seem overwhelming. Relax.