FC Folding Pocket Utility Knife - Heavy Duty Box Cutter with Holster, Quick Change Blades, Lock-Back Design, and Lightweight Aluminum Body - Amazon.com
Tape King Utility Knife Box Cutters (12-Pack Bulk, 18mm Wide Blade Cutter) - Retractable, Compact, Extended Use for Heavy Duty Office, Home, Arts Crafts, Hobby for Cutting Boxes, Cartons, Cardboard - Amazon.com
Utility Knife Heavy Duty Box Cutter| Craft 18mm Retractable and Auto Charge - Work Perfect in Everyday Use, TPR Handle, ABS Body and Anti Rust Blade Slot (3 Pack) - Amazon.com
MCO Multi-Purpose Box Cutter - Packability
Utility Knife Box Cutter Retractable Self Loading Heavy Duty Snap off Quick Change Extra Blades - China Cutting Tools, Hand Tools | Made-in-China.com