I leave the house every morning with 1-bib, 1-jersey, and 1-MTB short stuffed into the main compartment. I stick my post ride crocs in the shoe compartment and head off to work. After work at the trailhead I change out of my work store and stuff it all back into the bag. This exchange keeps everything in on place and organized and I LOVE IT! I also regularly keep a hat and sweatshirt in the helmet compartment as most of my gear is stored in the car. I even use the top compartment to store chapstick and bubble gum, or snacks on occasion.
This thing has interior pockets for gadgets and even a bottle opener ha!! Awesome bag! Truly awesome.
This pack is exactly what I was looking for. It is snug on your back and it really doesn't feel like its there. 2 things I had to get use to transitioning from a back pack to this are as you drink the water from the pack it becomes looser around your waist. This is an easy fix by pulling the waist strap to make up for the extra space the water was taking up. 2nd is when you hop forward off your seat and straddle the top tube the pack kinda gets stick under the seat as you are standing over your top tube. Not a problem as long as you twist your waist abit before hopping back on the saddle.
I use this pack to carry my water for medium to long rides, as well as any food, additional clothing, tubes, tire irons, tools I need to cover. The water bladder is large, and its weight is distributed over my hips, which is great for balance. The pack is comfortable -- but I haven't used it in really hot weather yet. I tend to pack a lot of stuff -- most people will find the capacity more than adequate. I like the way the bladder seals -- I prefer the fold and slide a clip to the screw-seal that the Camelback Mule uses. I still own a serviceable Camelback Mule, but will favor the Dakine pack.