Abstract: The present disclosure provides a product recommendation system and method for recommending products to add to a current transaction. The method includes, during a transaction process for one or more products: computing a parcel attribute of an expected parcel for shipping the one or more products, the parcel attribute being a weight or a dimension of the expected parcel, and identifying an applicable shipping rate for delivering the expected parcel. The method also includes determining an attribute increase threshold that corresponds to an increase in the shipping rate that is within a shipping rate increase threshold, identifying additional products each having a corresponding attribute that is within the attribute increase threshold, and generating a recommendation for the additional products in real-time during the transaction process. Responsive to receiving selection of one of the recommendations, including the corresponding additional product in the transaction process.