With this messenger bag fan photo, you can see that the flap has some kind of shiny / iridescent plastic coated material or interesting shimmer fabric. A cool effect that helps this bag stand out! Photo & owned by SurferBRG

These 4 items all have the same theme / are based upon eachother's design. Above you can see the first Sonic themed 'rolling style' school bag. Based on rolling luggage, this bag adds wheels & a pop up handle to the usual school bag design. Above right is a messenger bag with shoulder strap & side pocket. At left is the 'big' regular back pack - school bag. It comes in a slightly smaller size, but that pack is identically designed. It has side pocket, 2 outer pockets & the main bag part. At right is a matching lunch bag (soft-sides) with mesh side pocket, strap and handle.

The secondary design is interesting because it features Big the Cat for some reason. And he's...big...he looks like the star of that second design. There's Tails & Knuckles too, but since they kept proportions, Big is surely in the spot light. Notice the light blue plastic behind the Sonic with stars design on all of these...it has some sort of optical property. (Foil? glitter?)
The large backpack will be 17.99, the small 12.99 , the lunch bag is 10.99 and the messenger bag is 12.99. Want to get these now? The first store with them is echaracterz.com .