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Just a heads up, if you’re in the US, a lot of post offices have self serve kiosks away from the counter. You can use any envelope/packaging you like, as long as it fits on the scale at the kiosk.
Also, if you do decide to mail cash, fold it up inside another piece of paper. Maybe use two.
Idea being that some envelopes are translucent when held to the light, & cash is easy to spot. Folding it in paper will at least help with opacity.
And on a different note, you can legitimately use any packaging you like to mail something. It doesn’t have to be a blank envelope or packing box. You can literally slap an address & sufficient postage on a potato, & it will still reach its destination.
Do you have any of the reusable ziplock bags that come with a hand pump? I’ll bet that little pump would be gentle enough to do the trick.