Has anyone seen a…

Nalgene bottles also come in soft-sided versions, which are the ones I use (quart).  (Because the bottles are squeezable, they can be used to backflush a filter with more force than a hypo.  They also are easier to grab, but will stand up like a regular Nalgene when placed on a flat surface. Much friendlier to use.)

Why not just re-use a Mountain House (or other) bag.  It was purpose made for this job.  Granted, sealing capability is a bit questionable.  But if you want to travel with it while it’s cooking your meals, I’d seal it with it’s zipper, then fold that over and add a CNOC (or other) locking mechanism (binder clips?).

Also not sure on the durability.  If you want it to last because you can use it on many trips, then I’d just get a new one for each trip.  If you want it to last for one long trip, it may not fit the bill.

I liked Dan Y’s bottle.

Chris

Here?

https://www.uline.com/BL_75/Stand-Up-Barrier-Pouches

And in case you might need less than 300 of them, this looks like the same product sold in single quantities: https://www.packitgourmet.com/Cook-in-Bag.html

(Posted by Dan Y in the spoon thread.)

What is the matter with a plastic bag from the fruit section in your supermarket and a rubber band?
Or even a (tested) bread bag?

Cheers

Backcountry pantry makes a collapsible bowl that holds boiling water:
https://www.backpackerspantry.com/freeze-dried-food/sides-meats-extras/pack-bowl-4-pack