When requesting a quote for folding cartons, it’s important to be able to provide accurate measurements. Measuring folding cartons will help you get the right size ensuring that your products fit securely. The flaps must be the right size to ensure that everything closes properly and that the flaps secure the lid from opening. Measurements matter, and below is a breakdown on how to measure folding cartons and tray boxes. There are visuals to help you provide the correct dimensions.