i first saw this tutorial on babycenter and then subsequently found this one, and went more of this direction because i liked that there were no exposed edges in with the food in that last tutorial. just a personal preference. and of course i used the ripstop nylon on the inside so it is wipeable and the entire thing is washable.
it's closed with velcro that is cut in half lengthwise so it is easier for small hands to open.
the kids loved them...they were new and distracting for church:) the only downside is that it isn't airtight, obviously, so food can't stay indefinitely in them or it will get stale. but i am hopeful that this will help cut down on our ziplock bag consumption which is getting a little silly!