Ta-Dah!!!! Not only is he going to love the fact that his bag is covered in Angry Birds... it's going to be a lot more durable thanks to the duct tape!!!
All I did was lay the tape down in strip with enough to wrap a little bit around the other side... Keep doing this all the way up both sides of the bag... Then for the bottom, I made a seam so that the tape wouldn't peel up.
Done!!! And all for under $5.00