Some parts of Canada dispense milk in bags. It comes in a plastic bladder that you pop inside this pitcher and cut the corner off to pour. This shitpost is pretending that we pour the milk into the pitcher directly and store it uncovered.

For yr reference: https://www.cbc.ca/radio/costofliving/we-answer-your-burning-questions-about-things-like-milk-bags-tariffs-condo-insurance-and-printer-cartridges-1.5409407/here-s-why-milk-comes-in-bags-in-parts-of-canada-1.5409420