Where once I carried five books, tennis shoes, towel, shorts and t-shirt in a huge gym bag to work everyday, now I sleekly carry in a Kenneth ("Don't Call me Ken") Cole European shoulder bag all my daily needs.
Simple. The Kindle replaces the books. Weight = .000005 ounce, give or take.
No need for sneakers when I use the elliptical because my work shoes can double as my workout shoes. The durable shoes have lasted three years now.
No need for towel since I workout at the end of the workday.
So now I carry a Kindle, shorts and a T-shirt and I'm all set. Total weight on shoulder = -.5 ounces.