Both, actually. There are both kinds of bags available.
The cheap artificial Christmas tree storage bag on eBay is a bag made out of the same plastic material they use to make tarps. It looks like a duffle bag and even has a zipper to close the tree inside. They retail for $12.99USD.
An ambu bag is another name for a bag valve mask.
pericardium
pericardium
They're synthetic - man-made objects..
Artificial Manual Breathing Unit
Artificial manual re-breathing unit
Just get dog food that has lots of fiber in it, the nutrience levels are usually on the bag. Maybe you can get fiber pills as a subscription from your vet if your vet said he/she needed more fiber in his/her systom.
Artificial manual re-breathing unit
Not if it is an artificial sponge.
They can be paper, silk or plastic. They can be a blend of wood and vegetable fibers. The vegetable fiber is bleached pulp abaca hemp, a small tree grown for its fiber.
Artificial Christmas trees can be stored in a big bag or in their original box. The bag or box is then put into a storage bin or the individual's closet.