GoPro makes fantastic action cameras and the latest add-on makes them oh-so-much better. (Peep our hands-on here) The BacPac clips onto the HD Hero camera and allows for over 5 hours of recording. That’s more than double the built-in battery life. Plus, with a handy battery meter and rear-mounted mini USB port, there’s nothing not to love. Even the $49.99 MSRP is just about right. So yeah, snap on a battery BacPac and capture even more track footage — as long as you have an SD card large enough to handle that much 1080p video.