Chiropractor Isis M. Medina's rule is that you should tote no more than 10 percent of your body weight—so a bag that's more than 5 pounds when empty is a bad start. If your load is excessive, your head and neck jut forward rather than staying over your shoulders, which can lead to headaches, neck tension, and back pain.
Declutter your life! Our March issue features a complete guide to streamlining your life, from Peter Walsh's 30-Day Organization Challenge to innovative ways to clear your mind. Plus, go behind the scenes of Oprah's yard sale and find out how you can improve the world with a simple "hello."