What's your current Anker charger, and what's the model of your laptop.

Generally GaN Chargers will be smaller. Here's a tiny Anker GaN 65W.

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I asked about laptop bc some laptops are very picky about the voltage even if it's usbC PD, and may want more (100W+) wattage (they should still slow charge at lower 65W though).

Or some things like this design (just example of the ctedit card size flat profile, not endorsing the brand,)