If you buy a lot of your things online, but find returning online purchases an enormous hassle, this service is definitely worth checking out. Return Saver is an annual subscription service that allows you an unlimited amount of return shipping to any online retailer. From Clarus, Return Saver offers its services at a fixed fee so you don't have to worry about companies who won't usually pay to handle your returns.
For around $49 USD a year, returning online purchases via FedEx is otherwise free as long as the package does not weigh over 50 pounds and isn't longer than 130 inches. According to Springwise, frequent returners save money "on the USD 5-10 shipping costs that are typically spent shipping individual products back to the retailer."