ways to make small modifications to existing products

cardboard boxes

It's possible to resize a cardboard box.

• change the width and depth at the same time [1]
• reduce the height [1]

zip-loc bags

It's possible to reduce both the width and/or height of a reclosable bag.

• the "hot knife" method [1]
• the "coat hanger" method [1]
• the "crimp bag between two pieces of metal and heat the bit of plastic that sticks out" method [1]