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The Mono back has 1 soft bottle holster (which requires a Body Bottle Plus - not included) and a secure zippered pocket that fits an iPhone. It must be paired with either the Hi-Fi front (from the Groove Stereo) or the Lo–Fi front (from the Groove Mono), thus giving you the option to own an extra “back” section that can be traded out with one of the “front” sections for a 1 or 2 bottle option. Either way, the Groove System is for people who don’t normally like waist packs – it’s the most comfortable waist belt ever.
I've tried quite a few waist belts and this and the stereo take the cake. The mono is great for one body plus bottle plus room for an iphone and more. Comfortable and great fit. Simple to adjust on the run if you need to. No bounce even fully loaded. Love it! Great design and very functional. Johnny O on Jun 29th 2016