The Starbucks bag is a cheap alternative.
They are these (see photos) the traveler box and when you open it up you will see one of these inside Mylar bag it's stuck to the box with a little glue easy to pull out (Gently)!
If you ask the Manager how much for the tote without coffee they get that Does Not Compute look and most times I get it for free or a couple "Bucks" When I tell them what I am using it for.
I will buy a large coffee If I can finagle two off them.
I get about four or five trips out of them depending how much you use them.
Along with my Camel back one is good for me it holds a lot of liquid, more than a gallon and roll up to nothing when empty.
I am about compact (never stop thinking backpacking) as I have enough stuff taking up room, everything I wear and live in is bigger than average.
So something that rolls small enough to fit in my Coat pocket and holds that much liquid when ready is a plus.