Bright colors pose a safety hazard. Bright colors mean more ink is used, increasing the chance of heavy metals and solvents migrating into and out of the packaging. Once harmful substances enter the contents, it inevitably causes significant safety problems. Toys in snacks are dangerous. To attract children, more and more snacks come with small toys. These toys are often packaged in thin plastic bags mixed with the snacks. This easily leads to a reaction between the plastic bag containing the toy and the oils in the snack, releasing harmful substances. If the plastic bag breaks, the plastic toy can also contaminate the snack. Plastic should not be used to store hot or oily foods. Many plastic bags are made from various materials. Some, like polyethylene and polypropylene, are safe and can be used to hold food. However, many restaurants and breakfast stalls use thin plastic bags made of polyvinyl chloride (PVC), which is unsuitable for food. Using these bags to hold freshly fried dough sticks or hot noodles can cause harmful substances to leach out, potentially leading to chronic poisoning over time.

When choosing food packaging bags, follow the "look, smell, and touch" method.

First, check the outer packaging for damage, the presence of the QS mark (Quality Safety Certificate) for food production, and clear production and shelf-life dates.

Second, smell the food packaging for any unusual odors, especially those that come into direct contact with the food. If the packaging has a fragrance, be cautious; food packaging must be odorless, as scented packaging may contain excessive amounts of volatile substances.