found at DigiDirect
The Pelican 1525 Air Case with TrekPak Dividers System - Black trekPak uses pre-installed wall sections, divider panels, locking pins and tabs, and an easy-to-use cutting tool. Simply lay your gear in the case, measure and cut the divider sections, and lock them in place with the steel U-pins. The 7/16 thick divider sections are made of waterproof, closed-cell foam laminated to a rigid, corrugated plastic panel that resists tearing and shredding. The TrekPak is combined with 1 bottom foam and lid foam to give your gear 360° protection.
Your TrekPak Divider Kit includes two 20 dividers, two 15 dividers, two perimeter pieces, top and bottom foam, 20 pins and tabs, and a cutter tool.