I am now in the process of Gridfinitizing like my seventh drawer at this point, and this time it's my nightstand drawer where I keep most of my accessories, personal care items, and toiletries. Whereas I like to keep a tube of chap stick with me in most places – the car, the office, and in my bag – I tend to collect my surplus stock in my nightstand drawer. I wanted a simple and elegant way to store the maximum density of tubes I could fit in a 1x1 bin, and I couldn't find any good models that fit 4 tubes without using an excess of material. This bin is 1x1x3u, or about 21mm tall, and it fits all of the different lip balm tubes I encountered. The average tube in my stock were just over 16mm, so I packed four holes in the bin with a diameter of about 16.5mm. They fit perfectly and I'm happy with the design!