Shop / Modular System

Core Inserts

$12.99

Choose your insert

Free ground shipping over $100 · 200 in stock

Loose-leaf pages that build your system. Each insert has a single job, printed in light, low-density gray so structure supports your thinking without dominating the page. Premium B5 paper.

Shipping & returns

Ships to all 50 U.S. states via ground shipping. Free over $100. 30-day returns on unused items. Full policy →