The CamelChops Prairie  “CHIP” is a Front fitting frame bag that is a great alternative to the BLOCK if you carry two bottles! 
The “CHIP” secures via 5 x Hook/Loop strap attachments for a super secure fit. 
Made in Cordura 1000D True Timber waterproof fabric. YKK Aquaguard zipper to help protect against the elements. 
Measurements as follows :
Length - 300mm
Height ( At highest point) - 170mm 
Front Height - 45mm 
Rear Height - 70mm 
*All sizes approx*