This is an innovative product designed to help you use up every last bit of rosin and powder used in various sports like baseball, softball, track and field, and gymnastics. Size: Approximately 200mm x 130mm. Please understand that there may be slight variations in size due to the handmade nature of the product. It's very simple to use: Just open the zipper at the top of the bag and insert multiple used rosin bags. It's like having a brand new feel! You only need to wash it once a year during the off-season to keep it clean. I've been using mine for 7 years already! Using up every last bit of a rosin bag can be a "tedious" task. Your hands and clothes often get covered in powder, and you might end up "neglecting" or "throwing away" the bags. This product was created to eliminate that waste, and it's an idea that's surprisingly easy to use. Please give it a try! Thank you for looking.