As of December 2016, the Half Mass is No Longer AvailableThe Patagonia Half Mass is great for carrying your stuff short distances to and from the car. It doesn't work as well for biking as other bags because the shoulder strap is difficult to adjust. It provides quite a bit of laptop protection from slips and trips, but it was the second least weather resistant product that we tested. If you want a bag that can replace a briefcase and you don't plan on walking through a waterfall, the Patagonia Half Mass will probably suit your needs perfectly. Several people we talked to that own one had nothing but positive things to say, this bag just wasn't our favorite compared with the others we reviewed.
If you're looking for a bag to use primarily for bike commuting, check out our Top Pick winner, the Chrome Buran, which is more comfortable, more adjustable, and much more waterproof.