I tried this pack out on a couple of training rides for the event this weekend & love it. It doesn't feel as if i'm carrying anything, which is great! All my tools are in a small saddle bag. I found that it doesn't get in my way when i'm going downhill etc which is a relief from not being able to put a water bottle cage on my mtn bike.

I'll be using it on a 24km portion of the second half (to explain..we start & finish the 40km section in the same place..then go off and do a 24 km section then the rest. .. Each section has crucial time cut offs as mentioned....The end of the 40& 24km section has a support crew place where my dear will be with a hydration pack ready to go)

So, short rides go well with this hydration pack.