Perfect for practice, casual games, or competition. Filled with ‘resin’ beads these bags are “waterproof” in the sense that getting them wet won’t ruin them like bags filled with actual corn. Still not really playable in a rainy situation, though. Fine for humidity.There is a one Ince edge seam that you don’t find on other brands.I like the edge piece. When others complain that it's “gimmicky” I just hear them whining because they’re jealous.The design is cute and fun, and does the job of making it easy to separate your bags from your competitors’.These bags could double for use in learning how to juggle, if that idea floats your boat.You COULD purchase other brand bags cheaper, but these ideally and consistently weighted bags help your game and lend your it some panache.