Tween boys need backpacks that aren't overly cutesy, and especially at middle school boys need to ditch some of the characters of earlier years. There's too much frustration ahead for the youngster with a childish pack, and while he may love his faves of yesteryear, facing unkind remarks and rude behavior is a reality for too many middle schoolers. Help him with the transition by thinking about the backpack you choose...make sure that he's fine with the choice. Colorful isn't bad, especially if it's trendy and interesting. Just run it by your son first.
One of the brands I like for middle school boys bookbags is Quicksilver. There are lots of designs and plenty of motifs, both plain and colorful. You will find just a few displayed here, but be sure to check out their line.