In the buy it for many years price range:
I've got my eye on the Nite Ize Runoff for 3-1-1 size
https://www.niteize.com/product/RunO...-1-1-Pouch.asp and they also make a toiletry bag which is more dopp shaped
https://www.niteize.com/product/RunO...iletry-Bag.asp The runoff zippers are airtight
https://www.youtube.com/watch?v=N56RslJCCHo
Mammut makes a welded seam waterproof zipper pouch
https://www.mammut.com/us/en/p/2810-...rt-case-light/ as does Exped in a few more sizes
Overview | Exped International https://www.youtube.com/watch?v=7rTJ8nHAHZU&t=5s
Baggallini has a set of three clear pouches and the largest might be suitable?
https://www.baggallini.com/clear-tra...CTP485-BG.html
I don't have many recommendations within the lower price range. Most clear pouches seem to be oriented towards 311 quart capacity... I've seen a fewer larger ones meant for gift with purchase of cosmetics or VS. This is a bit shorter
https://www.amazon.com/Toiletry-Tran...=beauty&sr=1-9