When evaluating a Footbag Hacky Sack Factory, focus on the filling material, panel construction, and outer fabric. For professional play, sand-filled footbags offer better control and 'stall' capabilities, while plastic pellet-filled versions are more durable for casual kicking. Ensure the factory uses high-quality synthetic suede (Amara) or durable crochet cotton, as these materials provide the necessary friction. The panel count is also critical; 32-panel designs offer the most spherical shape and consistent flight, whereas 2-panel or 8-panel designs are more cost-effective for promotional giveaways.