If there's an tablet cover that packs convenience, it's got to be the Porter Module iPad Multi Organizer. From its size, you'd probably think that it's built for laptops; however, Porter designed this specifically for iPad users who require more than just protection.
The Porter Module iPad Multi Organizer is a multi-purpose case built for the business person who could use additional space for extra accessories. The sleek leather accessory has two main compartments secured by a zipper that will hold cables, paper or any random object that needs to be stored. An additional convenience is the handle that allow you to carry it like a briefcase instead of tucking it under your arms unlike most of the tablet sheaths on market.
This iPad cover is probably the most practical one due to its multi-functional features. It's now available at Oki-ni.