Take compact storage on the go with the 4TB Envoy Express Thunderbolt 3 External SSD from OWC. Its 1553 MB/s real-world transfer speed lets you perform on-location downloads of large media content like 8K video, high-res photo, and audio files in a blink. Transfer 5GB of GoPro footage in just three seconds. Weighing just 3.3 ounces and shorter than a ballpoint pen, the Envoy Express puts personal and work files in the palm of your hand. For the ultimate in out-of-the-way mobile use convenience, you can place the Envoy Express on the back of your laptop screen with the included removable slide mount.