My newest toy in my running toy box is my Camelbak 2011 Flash Flo LR hydration pack. It is super lightweight and can hold up to 50oz of fluid with plenty of room for pinole, potato wedges and Gu (my favorite snacks on the go!!)
I wasn't sure how I'd like running with something around my waist, and thought that it might bounce too much, but the compression straps on the outside of the pack are PERFECT for cinching down to almost zero movement! This is also handy as you are drinking and the bladder reduces in size.
The only down fall is the original length of the the waterline. I had to trim it down considerably after my first run and is held in place my two separate quick releases on the waist strap.
So far my longest run with my Flash Flo has been 15 miles but has worked out perfectly! The pack is HIGHLY reflective which is great for night running and is day-glo yellow for extra visibility during the daylight hours! I paid $39.00 at Kinnucan's in Auburn, AL and it has been worth every penny.
5 out of 5 Strides rating on this product!
For more color options and more specifics check out camelbak's website at: http://camelbak.com/sports-recreation/spring-summer-hydration-paks/2011-flash-flo-lr.aspx (this is a personal opinion and I was not compensated for this review, but I am more than happy to review your products)