"Good for DIY"
These boxes are double walled, and are probably as sturdy as you can get, with the possible exception of commercial removal firm boxes. Some old removal firm ones I have are very similar, with only one exception - they come with staples down one corner from top to bottom to hold the box together, whereas these are only glued together (hence 4 not 5 stars). In case the glue wasn't strong enough I put strong tape around that corner. The bottom & top halves meet well. A pen and tape were included - the pen is good but I chose not to use the tape. Delivery time and packaging were good.