Adjustable Extreme Sand Bag Set, 60-Pound by GoFit WEIGHT TRAINING: Integrates weight training with instability, to develop functional strength 3 SIZES: (10lb, 20lb & 30lb) of heavy-grade canvas sand bags insert into duffle Handle Bag HEAVY DUTY WEBBING: Handle grips made of heavy duty webbing; 4 handle positions DURABILITY & STABILITY: Heavy-grade canvas body; Reinforced stitching overall with zipper & snap closures for extra safety EASY TO FILL: Internal & external double Velcro closures for easy sand-filling & safety; sand not included Internal & external double Velcro closures for easy sand-filling & safety 3 sizes (10lb, 20lb & 30lb) of heavy-grade canvas sand bags insert into duffle Handle Bag Handle grips made of heavy duty webbing; 4 handle positions Heavy-grade canvas body; Reinforced stitching overall with zipper & snap closures for extra safety, durability & security Fills with standard playground sand; Sand not included