The numbers in the triangle refer to the type of plastic the product is made of. The number does not indicate whether the packaging is allowed in the blue PMD bag. Packaging may sometimes even have the same number (and consist of the same type of plastic) but may still not be treated or recycled in the same way. Variations in thickness or quality of the plastics may make it impossible to recycle them together. In some cases, the packaging (trays, dishes, yoghurt pots, butter tubs, et cetera) is not available in large enough quantities to enable efficient recycling.
If you want to find out whether your packaging is allowed in the blue PMD bag, we recommend checking the sorting rules for PMD. In the case of plastic packaging, only plastic bottles and flasks are allowed in the blue PMD bag.