The design came from my mind. I really love them. This week we were on holiday and the kids uses the backpacks. They worked perfect!
The size of the smallest one (with flowers) is about 18cmx15cm (7.5"x6")
The "soldier" version is about 25cmx30cm. (10"x12")
One thing what I did not mention: one of my sons seems to be left-handed. So I made a right-handed and a left-handed backpack. The zip is mirrored. This is the only difference.
And yes, they screamed!!! soooo loud what you cannot imagine!!!