Osprey Raptor 10L Men's Mountain Biking Backpack with Hydration Reservoir - Pediment Grey | Lightweight Cycling Pack for Trail Riding & Outdoor Adventures

Fantastic quality, as usual. The pack is small but doesn't feel small on the back - the shape is perfect to sit nicely against the natural curve of the back and ribs. The reservoir setup took a moment for me to access as I tried to figure out where it was - Osprey have used the zip for that compartment as part of the tube retention mechanism. The tube is held in place for most of it's length by a zipper than closes over it down the right strap - when opened, the tube is free and the reservoir compartment is open. I like this, though if you are a lefty it does mean you are stuck with the right-hand straw.The reservoir is large and sturdy, with a well-implemented sealing system. I found it to be watertight.The reservoir is held in place using a simple toggle, with the shape making it unlikely it would jump free at any point. This allows the reservoir some movement, which seems like it reduces the stress on the connection point - I could see a fully-loaded reservoir eventually tearing on more static connections.Aside from that, there is good storage in the bag. Enough for some warm/rain layers, first aid kit, and some food. You won't be going camping with just this bag, but it has enough room to be prepared. The repair kit storage is a good addition - you can store some of your essential bike repair gear in here. I found it can take my multitool (chain tool, allen wrenches, ratchet wrench with multiple bits, puncture repair kit, extra tire levers, and a spare tube). I didn't have any issues with space and I don't even have the "best" gear (which is usually smaller in inverse proportion to its price).As for riding, I found that it was comfy while loose and while tightly cinched, though the more... ahem...robust gentleperson may find the belt strap a little restrictive when leaning forward. I didn't notice any major problem with not wearing the waist strap. The limited volume of the bag means it is unlikely to be so heavy that the waist strap becomes essential.This is a comfortable bag for a niche use - do not buy if you are looking for a hiking day pack as the biking-specific features are everywhere and will limit the value you get out of it. If you're going for a day out on your bike, this is the option to use. You can carry everything you need to help get you home and look good doing it.Easy recommendation.