Becky Westerinenwrote a review of CamelBak Zoid Winter Hydration Pack - 183cu in on January 5, 2017
Familiarity: I've used it several times
The camelback part of it is great. Enough water to last -almost- a full day of climbing (though I should probably drink more water...) and the zip compartment for the valve is really convenient. I got this pack specifically for days on the wall (multipitch) because it's small profile and doesn't have a waist strap. My climbing partner has a bigger pack to bring food and first aid stuff, that would never fit in this one.
Downsides... the wide straps rubbed against my shoulders and caused some irritation after a day or two of climbing. The front pocket also doesn't fit an iPhone 7+, which is more my fault. Fits the smaller sized iPhones just fine. I throw my phone in the same compartment as the camelback so it works out fine, though.