The Day Sling from Aer is a stylish smaller sling with a bunch of organization for minimal daily carry.
Other Bags to Check Out:
The Daypack from Qwstion has serious design chops. It's simple and elegant with thoughtful organization for modern business folks who need backpack/briefcase conversion. It even works to wear with a suit!
The Day Tote from Qwstion is a remarkably designed bag that's surprisingly awesome to use.
The Messenger Bag from Nomatic is chock-full of organization and tech-lifestyle features for the modern commuter.
The Wilderness Rucksack from Tanner Goods is a gorgeous, artisan, hand-shucked heirloom bag that your grandpa would be proud of (whichever one of your grandpas was more badass).
A classic daypack with plush and delightful materials and designs and some extra room for whatever kinds of bulky things you may need to carry.