Will my macbook pro fit inside of this sleeve/bag while a case is on it?

Here is the case I plan to put on my macbook:

http://www.apple.com/shop/product/HD579ZM/B/tech21-impact-snap-case-for-13-inch- macbook-pro-with-retina-display?fnode=5498ae9f2eb8ba1b7d5c8bdb37a651a75724b784f5 68544e346a019fa962d4bb167595d1c829e667ebea457162f095a05443f6b2aa6cc018a9ef691abc 3b5370fb0e999464dd75723cebc45f720c2824ef87a547ab04202cb21bc6fd353d74494face39760 96f613ffe6112ec563bfd5

and here is the sleeve/bag in question:

http://www.apple.com/shop/product/HHTX2ZM/A/incase-15-reform-collection-tensaerl ite-brief-bag?fnode=f598879aaeb701e2fe43fa60487f8de918fad0da63ce7b068fad13e1a42c ed7f1f8d047683cc1b6719a25ceb377ec1cfc4c0da0690aeda2da8944fbc2443d8188b95dbc0dfef 17e5300c004f022ca60d62a6bcc61c6f37e0bab0a8bb104e543eab9ddcf562a68eaf848303c0c9f4 7b67

I sincerely hope that the links provided are permalinks, but if not, here are the product names:

case: Tech21 Impact Snap Case for 13-inch MacBook Pro

sleeve/bag: Incase 13" Reform Collection Tensaerlite Brief Bag

For clarification purposes, the laptop is a 13" macbook pro with retina display, I am concerned with whether or not my macbook will fit inside of the bag if I have a case on it. If it does not fit inside if its intended bag, would it work if I purchase the 15" for my 13" with a case on it? Leaving the case off is not an option, and I would prefer not to waste money on a bag that won't fit the laptop with its case.

I am looking forward to your answers, have a great day!