The Field Repair Buckle is designed to permanently repair b... The Field Repair Buckle is designed to permanently repair broken buckles with just the help of a screwdriver. All Sea to Summit dry bags feature Field Repair Buckles, from the lightest Ultra-Sil Nano dry sack to the heaviest Hydraulic dry bag. Don&';t let a broken buckle ruin your adventure. Be prepared and carry a Field Repair Buckle in your repair kit. Features Removeable, stainless steel pin with Phillips head Replaces worn or broken buckles for a range of equipment For backpacks, messenger bags, PFDs Which buckle do I need? One-pin side release buckles replace closures found on most top-loading backpacks, daypacks, messenger bags, PFDs, bike bags etc. They have one fixed end and one ladderlock end - the ladderlock allows you to thread through a webbing strap which can then be tightened or loosened. Two-pin side release buckles are a direct replacement for non-adjustable buckles, commonly found on dry bag closures and some backpack waist belts. They are not adjustable.