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Discover LudwigThe phrase "a waterproof envelope" is correct and usable in written English.
You can use it when referring to an envelope designed to resist water and protect its contents from moisture.
Example: "I always carry a waterproof envelope when hiking to keep my maps and important documents safe from rain."
Alternatives: "a water-resistant envelope" or "a moisture-proof envelope."
Exact(1)
Put sensitive documents such as ID, Passport and financial accounts in a waterproof envelope and keep them in a safe and secure place for quick evacuation in case of floods, hurricanes or other natural disasters.
Similar(59)
It's also represented in physical form as brightly coloured plastic cassettes packed into neat waterproof envelopes; each cassette is accompanied by a selection of postcards designed according to the artist's wishes.
The shadow figures were repackaged in tissue paper and waterproof envelopes for temporary storage.
Each cylindrical phantom hosted a waterproof PMMA stick containing 3 TLD chips encapsulated by a polystyrene envelope (for a total of 18 chips).
Place it on a waterproof tray.
Who would buy a waterproof book?
A waterproof microphone at Tidmarsh captures live audio.
Why might the Tokyo police want a waterproof tablet?
Choose a waterproof version.
Creating A Waterproof iPad Case.
Rather belatedly, he shoves it into a waterproof bag.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com