I'm new to electronics but this seems perfect to me. It's big enough for me to work on my basic Arduino layouts and projects. It's thicker and heavier than I expected but easily fits in my backpack; Bought the smallest version. I have cupcake pans made out of the same material but this one is heavier than this one. There are no build quality issues. The company's odor warning alerted me. I was expecting a stronger than usual new plastic smell, but in fact there was none at all. On a stable table, the bags work perfectly.