3dcart’s Restrictive Shipping add-on allows you to restrict individual products to use specific shipping methods when they are purchased.
For example, if your store sells a mixture of perishable and non-perishable items, you may need to restrict your perishable items to use an overnight shipping method whenever it is present on the order. This way, regardless of whether your customer purchases a perishable item on its own or in conjunction with non-perishable items, the restricted shipping method will always apply to the order.