Energy Packs Physical Training Strength Packs Fitness Building Sandbags Squats Weight Bearing Equipment Multifunctional Weightlifting SandbagsProduct information Color Classification: Vigor Red 5KG (empty skin self filling ) Vigor Red 10KG (Empty Leather Self filling) Vigor Red 15KG (Empty Leather Self filling) Vigor Red 20KG (Empty Leather Self filling) Vigor Red 25KG (Empty Leather Self filling) Vigor Red 30KG (Empty Leather Self filling) Cool Black 5KG (Empty Leather Self filling) Cool Black 10KG (empty leather self filling) Cool black 15KG (empty leather self filling) Cool black 20KG