What material do people use to stiffen up bags (thinking particularly of a bag base) and give them some structure and where's best to order a hobbyist quantity from?
Around here coroplast is widely used in commercial and election signs. Since most of them are illegally posted on boulevards I just pick one up when required.
What material do people use to stiffen up bags (thinking particularly of a bag base) and give them some structure and where's best to order a hobbyist quantity from?