A pocket for a 7" tablet would be huge. To be honest, i havent seen one yet. For now, i bluetooth tether my phone, and leave it in my pocket. Uses way less battey than wifi.
I was looking for. A similar setup when i was using my playbook.
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Current devices: Galaxy Note 2 Stock,Nexus 4-stock, galaxy tab 2-7, galaxy note 10.1
Sensation 4G Bruce cm10 jellybean, Asus TF300, Blackberry Playbook, Nexus 1, SE Xperia x1a,HTC Kaiser,Nokia N80,Sony Ericsson W800, Nokia 9500, Motorolla MPX 300 (winmo3), and dozens more. also have an iphone 3g and ipad2 in the family.