The Gator Grip GG-RTB-WHITE Fish Weigh Bag, White and Black Inside. We have known for years that a black bag helps calm the fish during transport. Ever thought of how hot your black bag gets during a parking lot weigh-in? The solution is a white exterior to help reflect the suns rays and a black interior to help calm your catch. Seven layers of reinforced polyester bag. The bag has a white exterior to reflect the suns rays and a black interior to calm your fish.