One good trick is to place a tent pole or straight stick across the top end of the sleeping bag and roll the bag around it, instead of around itself.
Keep one knee pressed tightly into the center of the sleeping bag while you pull the elasticated straps evenly over the rolled bag or tie the cords around it. If you’re using the cords, you can use the same basic knot you use to tie your shoelaces. If the sleeping bag has no straps or cords, simply tie a loose piece of string around both ends of the rolled bag. Once the sleeping bag is secure, you can gently pull the tent pole or stick out of the middle (if used) and pop the perfectly rolled sleeping bag into its carrier bag.
