Not a gadget but a condom has a 99% chance of making your life easier.

http://www.amazon.com/Yens%C2%AE-Fantasybag-3-Zipper-Pack-Black-FN-03/dp/B003C8SUV8/ref=sr_1_1?ie=UTF8&qid=1405643309&sr=8-1&keywords=fanny+pack This has a 100% chance, if you know what im saying