Been using a Raptor 10 for a while. Well made and generally comfortable. I like being able to slide the reservoir in and out even when the pack is crammed. The only thing I’d be wary of is that the stiffened bladder and generally stiffened back system very gradually rubbed a raw patch on my lower back through my top despite it being countoured to fit. I now cinch up the shoulder straps slightly more so it sits a little higher and doesn’t rub.
Edit: there’s also an Osprey called the Synchro, sort of a lighter, stripped down Raptor without the stiff back – don’t think it comes with a bladder fwiw – which might be an alternative, the one missing thing with that – or with the 15 anyway, is that there’s no compression ssytem, so contents can bang around it it’s part filled.
I’ve been using one of the new Haglöfs Gram lightweight packs – non bike specific – and that works well on a bike, though the full length back zip opening isn’t mud/wet grit friendly. The Escapist is very nice too and was designed to be bike specific.
I don’t know how any of them compare with a Camelbak as I’ve not used one. I don’t think the bite valve is as good as the Camelbak one, but the reservoir is slightly pressurised in use and that seems to up the flow enough that it works pretty well.