Many External Frame Backpacks can be easily removed so the bag can be machine washed. In some models, not only can the pack be removed, you can use the frame for other purposes such as carrying an animal you have hunted back to camp, or using it as a stretcher for an injured camper or just to assist with moving heavy objects. If you are worried about not being able to clean your bag in the washing machine, ask the salesperson in your camping supply store before you make the purchase. This would also be a good time to have the salesperson show you how to remove the pack when you need to clean it.\r