Under the revenue sharing contract and the retailer recycling model, the packaging size and product line selection of large and small products were studied. By depicting the Stackelberg game model based on consumers’ willingness to pay, the impact of unit size production cost on packaging size and the impact of unit size production cost were analyzed, as well as the impacts of revenue sharing coefficient and packaging recovery rate on each member of the supply chain and the overall optimal profit. A detailed analysis was made on the choice of the two packaging sizes and product lines. The research results showed that with the increase in production costs per unit size, both manufacturers and retailers should choose products with small package sizes; with the increase in the recycling rate of large and small packages, the optimal profits of manufacturers, retailers and the overall supply chain would increase; as the revenue sharing coefficient increased, the optimal profit of the producer and the supply chain as a whole would increase, while the optimal profit of the retailer would decrease. When the production cost per unit size exceeded a certain threshold, large package size products would be more beneficial to all parties in the supply chain and the whole system.