Nylon/Poly Bags: These bags are made from tough, durable fabric (like backpack material). If you have to wash your bag, we recommend spot cleaning first. If you need to machine wash your bag, do so on COLD only and hang them to dry. If your bags are not dirty but have collected lint amongst the toys or have dust/lint on the outside of the bag, empty toys into a container, shake out your bag and place it in the dryer for 15 minutes on NO HEAT. Voila! Feels like new!Canvas Swoop Bags: These bags are made from 100% cotton CANVAS. We recommend only cleaning your bags if necessary. Spot cleaning your Swoop is best if just a small area is dirty. You can machine wash these bag (COLD only/hang to dry) but due to the nature of this natural fabric, the canvas will become slightly wrinkled after washing. You can iron or steam clean to fully get the wrinkles out. If your bags are not dirty but have collected lint amongst the toys or have dust/lint on the outside of the bag, empty toys into a container, shake out your bag and place it in the dryer for 15 minutes on NO HEAT. Voila! Feels like new!