If you crave the flexibility to pack a few things you know you'll never use, the Timbuk2 Ramble Pack is for you. It's roomy but reasonable, so it makes an excellent everyday carry.
Exterior pocketing on the Ramble Pack offers easy access to must-have phone, cards, and shades. While a roomy interior offers enough space to pack that just-in-case layer in addition to the requisite laptop, lunch, and refreshment. Ramble on!