Always Practice Preventive Care
If you sleep in the open, always use a ground cloth underneath your bag, never place it directly on the bare ground. Dirt can become ground into the bag during the course of the night and rocks or even small twigs can puncture or tear the shell. If you sleep inside a tent, be sure the tent floor is clean and dry. If you're sleeping on the floor of a cabin, again a ground cloth will protect against dirt, stains or splinters in the wood floor. It's a good idea to wear a tee shirt, shorts and socks in the bag to help reduce the amount of body oil transfer to the interior of the bag or use a bag liner to accomplish the same goal. Both will also add warmth by creating pockets of insulating air.