Nothing you don't need, but room for improvement.
After finding my AK 2.0 vest a bit too small, I was excited to get my hands on the TO 3.0. I don't use a bladder and I just wanted a vest that could accommodate two bottles and limited gear. The vest does this well. It is highly adjustable and super light. The two bottle pockets function well and the two stretchy pockets beneath them hold my phone and a pair of gloves or hat without issue. I can fit a lightweight shell in the larger (white) stretchy back pocket and keys and things in the other (black) back pocket and it is all relatively comfortable. The mesh and the edge binding are both significantly softer than the 2.0 versions. The fit keeps the "collar" of the vest from chafing your neck, which was an issue in the AK 2.0 for me. It is much more comfortable when wearing a singlet or going shirtless. Though I like vest enough to give it 4 stars, I do have two issues with it. First, the two pockets above the bottles should have been placed higher up on the vest as when I put a gel flask in the stretchy one, the bottle on that side pushes it up and out of the pocket and the two are just in each other's way. Second, while the back of the pack is longer than the front (this was a needed changed from the 2.0), the attachment points for the side straps on the front and back leave the straps parallel. The vest would achieve less bottle bounce if the strap attachment points were lower on the rear panels, and angled up from there to the front panels. This would serve to "pull" down on the front panels and hold the bottles closer to the body. I would think UD would have figured this out by now. Also, the side straps would benefit from some "stretch" maybe by using elastic webbing at the attachment points. This would improve mobility a bit while keeping the vest cinched down. I think UD needs to stop relying solely on their athletes for product testing and seek more feedback from it's customers on designs. All in all, it is an improvement from the AK 2.0, but it's not quite there yet. It could have been a great vest but, unfortunately, the few shortcomings in it's design leave it a bit lackluster in my opinion.