There are two fun designs on offer - Jack the dog, and SunMoon the monkey - and coming soon are a penguin, pick-up truck and a jumbo jet.
"They are guaranteed to encourage children - and teachers - to get into the habit of saving, sharing and transporting their work," says Rob Gill, founder. "And they are perfect for primary pupils to take work with them for their first year at secondary school."
Price: pound;10 each. For orders of 20 plus, pound;7 each. PP pound;2.