You know the way you open a packet of Doritos or sweets or some sort of a bag.. and you can roll it up, hoping it will stay closed, only for it to pop back into an open position?
Yeah, that’s very annoying 😡 anyway, i came across this video on youtube – a tutorial on how to tightly seal a bag of doritos 
[youtube]http://www.youtube.com/watch?v=9rB6bf8DqMQ[/youtube]