Your Desk Has a Whole Dimension You Are Not Using
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Think about how a desk actually gets used. Everything you own lives on one horizontal plane, competing for the same square footage, at the same height, in one layer. When the desk fills up, the only move available is to stack, and stacking means the thing you need is underneath something else.
Meanwhile there is an entire vertical dimension above the surface doing absolutely nothing.
Why nobody uses it
The standard answer to vertical storage is shelves or a wall-mounted pegboard, and both come with a barrier: they need a wall, they need drilling, and they need you to commit to a position permanently. If you rent, or the desk is not against a wall, or you rearrange things every few months, that is enough friction to stop the idea before it starts.
A panel that stands on its own feet removes the whole objection. It goes on the desk, it can be picked up and moved, and it works on a desk that faces into a room.
What it is good at, and what it is not
Pegboard is best for light things you reach for often. Scissors, tape, headphones, cable ends, brushes, small tools, a notebook. Anything you currently hunt for in a drawer is a candidate, because pegboard's real advantage is not capacity, it is that everything is visible at once.
It is not good for heavy things. This is a desktop panel on feet, not a load-bearing wall system. Hang a heavy toolbag off the top corner and physics will have opinions.

The numbers that decide whether accessories fit
This is the part most listings bury, and it is the only part that determines whether the hooks in your drawer will work.
Our desktop pegboard panel is 9 by 9 inches, with holes of about 9/32 of an inch, spaced 1 inch centre to centre. That spacing is the long-standing common standard for pegboard, which means accessories cut to a 1 inch grid will sit correctly. Accessories built for a different grid, particularly the finer metric spacings some systems use, will not.
It is white plastic, and it comes with its two matching feet. Worth checking the product page for exactly which hooks are included before you order, and worth keeping the panel out of a baking window or a hot car, which is good practice for any light plastic panel.
The obvious companion purchase is more hooks than you think you need. Everyone underestimates, then puts the third pair of scissors back in the drawer.
See the desktop pegboard panel
If the problem is less about space and more about things having nowhere to go, why your desk gets messy again covers the other half of this.