Transportation
Mummy sleeping bags are meant to be packed into stuff sacks, which are usually supplied with the bag. Slide the main zipper of the bag about three-quarters open, then stuff it into the sack. If your bag is down sleeping bags, keep it away from liquids and protect it in a waterproof bag (or garbage bag in a pinch) if it rains.
Care of Your Sleeping Bag
Sleeping bags should be stored dry and loose, not in the stuff sack. They also need to be washed periodically, preferably by hand, with mild soap or specially formulated sleeping bag wash. Help keep the bag clean on the outside by using a clean pad, and on the inside by wearing extra layers to bed or by using a sleeping bag liner. Note that both of these options will add to the warmth rating of the bag.