The best way to avoid the issues with fiber-based cups is to avoid them entirely, which can be done through a travel mug rental system. This travel mug rental system, called Rent-a-Mug would involve coffee shops buying a large stock of travel mugs and "renting" them to their customers. When a customer purchases a drink, they will be asked if they want it in a rentable mug or a normal paper cup. The mug will cost an additional $20 (can be adjusted based on the price of the cup). If the customer does not bring the mug back, they will have essentially bought a new mug. However, if they do return it they will be credited $22, which will basically be giving them $2 off of their next cup of coffee. One of the best parts of this system is that if customers do not return the mugs, the coffee shop has sold a mug and has profited on that mug transaction separately from the original profit on the coffee itself.