I bought jay through the kickstarter campaign and haven't looked back since. It has to be the most practical city pack for outings with computer, running errands, dropping things off, buying small items, just having your bike gear with you without even so much as a thought ...
the inside compartments makes arranging things easy, it protects an A4 envelope beautifully if needs be, the lid is super fast and safe, it's water resistant even in northern German weather, the pack is sturdy and doesn't cling to your back, and the outside stretch pockets are just brilliant for bike gear, your glasses, a small bottle - things your need with a flick of a wrist ... not to forget the hidden pouch for you purse or passport or so.
it really is one of the most thought-out, incredibly well-made and sturdy products I am using. I cannot recommend this thing enough.