Why do junk foods containers bloat in cold places?

Junk food containers can bloat in cold places due to the contraction of gases inside the packaging. When the temperature drops, the air inside the container cools and decreases in pressure, causing the flexible packaging to expand as it tries to equalize with the external pressure. Additionally, if the food contains any moisture, condensation can occur, further contributing to the swelling of the container. This phenomenon is more pronounced in sealed packages that can trap gases more easily.