The SPIbelt is Sleek, expandable, secure and does not bounce. The SPIbelt can hold an iPod, Blackberry, cell, keys, up to five GU packs, and other small personal items. The SPIbelt does not bounce, ride or shift while running or doing other activities. The SPIbelt is great for athletic events, traveling, carrying diabetic supplies, and much more! Fits Waist 24" - 40+"