This is one of the best cable storage boxes I’ve used. I ordered the largest size and it holds two power strips with an assortment of plugs and transformers. It makes the floor under my home office desk easier to keep clean and prevents curious canine mouths from exploring. The product did not come with any instructions (nor were any needed) but I was curious of the function of the odd-shaped cut-out on one side as shown in my first photo; I assume it’s for ventilation. Very pleased and ordered a second one as a gift.