From Revelate Designs website:
"Tangle™ bags are rectangular-shaped half frame bags. They can be used for everyday riding & commuting, or any adventure big and small.
The main compartment features an exit port for a hydration tube or battery wire, a zippered flat left side pocket holds smaller stuff. Attachment is made with reinforced velcro along the top tube, other mounts are adjustiable with webbing and low profile camlock buckles with strap keepers. All attachment points bartacked for strength.
Tangle's usually leave room for both water bottle mounts. To check, measure the vertical height from the top of the bottle to the top tube and compare with bag height. In some cases you may need to use side entering cages or smaller bottles."