Bino Kit lets you carry binoculars in Capture, meaning your binoculars stay rigidly fixed to your backpack strap or belt, yet remain instantly accessible with the click of a button.
This extremely high-production-value video sums up everything you need to know about Bino Kit. Note that the video mentions "CaptureBINO" which is a discontinued version of Capture that came with Bino Kit. Bino Kit is now sold as a standalone accessory. You can buy Bino Kit + Capture (Clip Only) for a complete bio carry solution. You can also probably find CaptureBINO on Amazon.