I might recommend a drawer instead of a box. It might look cleaner. There are some on Etsy. Like this one: https://www.etsy.com/listing/1890785420/ most of the ones I’ve seen are black, this one comes in white. More on reddit.com

Sysmax Hive Desk Organizer. It's 2x3 angled slots and has a drawer at the bottom. Or 2x3 with three narrow drawers stacked. It's a Korean brand uses pretty hard high quality plastic. I bought mine from winners/homesense. It's available online too. There are also angled container slots that are 3x1 from Daiso. They're cheaper and you could buy multiple ones and make a 3xgrid of whatever you want. I use a lot of supplies too and I like taking advantage of the vertical organization. edit for photo: More on reddit.com

ah, floor boxes. my favorite storage method. More on reddit.com

Monitor arms, the amount of desk space I reclaimed is impressive. Also, my monitors are better placed resulting in less neck strain. I had monitors with decent stands too, height, tilt, rotation on the stands, but still not as good as arms. EDIT: This is to address comments on the downsides of arms for anyone reading this so you go in knowing what you need to should you consider them: Arms on Amazon: since this is where most of you are likely to buy them from, I'll address this first. Buyer beware! The quality of arms available on Amazon varies a lot. There are some good ones, there are some real pieces of crap on there too. Amazon being the dumpster fire of non-legit third party sellers scattered among legit sellers and product ID swaps with good reviews mentioning something that has nothing to do with the product listed, it can be really hit or miss. I'd buy them from somewhere if I could (and I did). Arms sagging is a thing. Not all arms can hold the same amount of weight. Oversize the weight rating, especially on cheaper arms. Sellers tend to be rather "enthusiastic" about what they say their arms can take. You've got a 34" 1440p ultrawide display! Get a beefy arm, it'll cost more, but your monitor is a chonky boy, so it needs a more robust arm. Behind desk space: this is a truly legit concern, some arms can require a fair bit of space behind to position the monitors appropriately. Single vs dual vs triple arm: plan this well. Keep in mind that dual and triple arms are fixed to the desk in a single location and that will also mean you'll need more space behind the desk for the arms. My personal recommendation for dual monitors: get two singles. You'll only need a few inches behind the desk at most since you can clamp the arms at different locations on the desk. Another solution is to drill a hole in the desk and use the other type of attachment. You can mount the arm smack dab in the middle of the desk if you want with that. Of course, you desk will have a permanent hole in it too. I first got a dual arm, it's in a box on a shelf and I'm rocking two singles for a reason. EDIT 2: Another fair point made: desks that are fragile, think Ikea Linmonn with a hollow core can get damaged by smaller clamps. EDIT 3: This is my old rig , but with the arms I use and two 24" monitors (main since replaced). You can somewhat see the space between the wall and desk with two single arms. Under desk cable management baskets which are also incredibly useful. More on reddit.com