Here are 2 different bags with the same design. Its the "Sonic The World's Fastest Hedgehog" theme that appeared soon after Generations. It has Modern Sonic jumping in front of Ariel Bold font for the text. This has been used on several items.
The bag to the left is a "Scissor Bag". It has 2 metal lead loops for a possible strap, plus key clip type ring on a little strap. It is made of canvas. The right bag is the "Mini Bag" which has a snap closure and is smaller, but still made of canvas. The mini bag was for sale at the Sonic 20th Anniversary event at Joypolis in Japan.