The side pockets are one of the few minor quibbles I have with the Shift. They're a good use of space, especially in a bag where storage is limited, however I think they're best suited for stuff you won't want access to for most of your round. They're not as easy access as I would have thought--I can only unzip them halfway or so one handed. And since they're shallow, stuff falls out very easily if you leave it unzipped, especially when putting it on. And even though it's tough to unzip them past the halfway point one handed, they have an uncanny ability to unzip the rest of the way on their own, given enough time. On several occasions, I had something in my hip pocket, with it half unzipped, only to find later that it had come fully unzipped at some point and the pocket was now empty. Fortunately, it was never anything too valuable, but I learned my lesson. Now I only keep some miscellaneous things in there like ibuprofen, sunblock, lip balm, etc., stuff that I only access now and then.
One thing I was concerned about when I got the bag was if I'd have an easy place to keep my phone. I like to keep score on my phone most of the time, so having access is key. On other bags, the second bottle holder or side pocket usually works well, but obviously those things are limited here. I was happy to discover that the mini pocket holds my Galaxy perfectly. It keeps it nice and snug and out of the way of other things, and is super easy access.