pedln... I bought a Zagg folio for my IPAD.
www.zagg.com/iPad4+KeyboardCase It has a place in the top for the IPAD and a keyboard on the bottom. It folds up and fits in my large purse with kind of a protective covering. As Mary said, you can connect/unconnect the bluetooth wireless connection for the keyboard.
There are no USB ports as you're thinking of them. We were told at the Apple Store we will need to get a printer that is an "air" printer and then we can print from the IPAD.
I absolutely love mine. I've got all my Nook books (500)+ available with the Nook app and I've also got a collection of Kindle books with the Kindle app and I could get IBooks, too, if I chose. My husband prefers to get his books that way. We don't want our "collections" mingling, since our tastes are so different. We do share apps....so if any minimal charge involved, we both can have them for the price of one. Music, books, apps sharing can easily be turned on or off.
I have a cloud account, but I honestly don't understand all of that yet. I do keep notes and documents on the IPAD, but nothing that's a big deal. When I get home, I'll use my desktop for our family $$ business, Quicken, etc., and probably not mess with a laptop again. I know I'll not travel with one again. I can easily catch up on Quicken when I'm home. I can monitor the bank accounts, pay online, etc. easily with the IPAD. I've done it several times and it's as easy as with any laptop.
jane