Inov-8 Race Pro 4
Here's what other sites are saying:
The Race Pro Pack (4L) by Inov8 is a functional belt pack designed exclusively for those atheletes who like to run far, hike fast and stay hydrated while they do their thing. The Race Pro Pack uses Inov8's own hydration system that fits around the lumbar region adding support and stability while being easily accessible. This lumbar pack has plenty of storage for clothing, food and extra items while also providing a pack that doesn't slosh, move or irritate you while you push your limits. Equipped with a large main compartment, two hip fin pockets and external bungees makes the Race Pro Pack (4L) ideal for long distance running, cycling or light and fast walks. BLADDER SOLD SEPARATELY!