When I needed a Silica Container for my Bambu lab spools, I decided to open Fusion 360 and design my own. I made it so, that it has a build in hydrometer. I used these ones, and they work perfect.
https://www.amazon.com.be/dp/B07JG9QZ2B?ref=ppx_yo2ov_dt_b_product_details&th=1
I printed them in basic PLA from Bambu Lab with a 0.4 nozzle.