Customers say this reusable mailer is incredibly easy to use and appreciate its environmental benefits. Many reviews mention the sturdy, durable construction that protects items during shipping. Users consistently praise the simple return process, though some initially found instructions unclear or wished for pre-printed return labels. Common feedback includes appreciation for reducing waste and landfill impact. Frequent comments address the convenience of the zip-tie closure and clear plastic envelope for packing slips. While most find the concept brilliant and want other companies to adopt it, a few experienced confusion about return procedures or postal service unfamiliarity with the system.