Available for 11”, 13”, and 15” MacBooks, Tucano’s Stand Up Sleeve Cargo ($50) is one of the more ingenious laptop cases we’ve seen in some time. Although it’s called a sleeve, it’s actually a zip-open case that stays on your computer even when it’s in use, with clear plastic bands holding the MacBook’s top and bottom corners in place. What sticks out—literally—is a special part on…