Secure, quick access, and versatility were the foundational requirements when designing the TracPak. We wanted the ability to mount one or two storage boxes on a MightyMount or GearTrac, and with the TracPak, you can stack two boxes onto a single mounting point, helping save track space for other accessories. Construction & Technology: Features a quick release track base compatible with all YakAttack MightyMounts, GearTrac, and most other factory-installed kayak track When attached to a track, the Quick Release Base features an array of slots, allowing for micro-adjustments in each direction of the t-bolt Included are stainless steel screws for attachment on the BlackPak Pro, the deck of your kayak, or other flat surfaces The stackable storage boxes quickly and securely snap onto the base and on top of each other Included are four white labels Designed for use in harsh marine conditions Covered by our Built for Life Guarantee Additional Details: For surface mounting on anything other than the BlackPak Pro, a 1/8 drill bit will be required for the installation Interior dimensions measuring 8.375 x 5.375 x 2.375 The TracPak is not waterproof or water-tight and does not float, so each storage box features an eyelet if you choose to use a leash for added security