Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Any idea how much volume these hold? I'm not trying to use a tip, just cut the end off and use for all kinds of stuff.
Document: The bag that starts out at 12 inches ends up being quite a bit smaller in practical use since you must cut the small end for the tip or coupler and need to allow several inches at the wide opening in order to twist the bag closed after filling it halfway with icing. It makes these 12 inch bags the right size for small amounts of frosting, enough for accents and small designs, but not enough to do a whole cake or batch of cupcakes without refilling it several times.
I've used these for making French Macarons, piping buttercream and other fillings and they work super well. They aren't huge but they are large enough and easy to control. I do recommend paying attention to the sealed end - don't fill them without putting a tip in (I've done that and piped filling tip-free by clipping a bit off the sealed tip. They work either with a pastry tip or for simple filling jobs like sandwich cookies, just cut off a little more plastic.
I found these bags weird at first. They come in a roll attached at the seams to one another, but pull apart easily and function very well. I find they don't hold as much as the Wilton bags, but only by an ounce or so. They cut well, and so far seem to be strong enough for thick frostings.
Love these! They are not the normal equilateral triangle shape. The tip feels narrower than the Wilson bags, but I like that. Less leakage around the tip. They hold a little less icing, but I rarely fill up the whole bag anyway. I like them way better than the Wilson bags and they are so much cheaper. I haven't had one tear on me yet, because they are a thicker plastic.
Been practicing on my designs for chocolate cake pops and whoopies. Very easy to use and no mess to clean up. I just drop about 8 chocolate melting chips in the bag and put in microwave. Cut the bottom tip to the size I need and practice my designs. When done, toss the bag and no mess to clean up. Bags are strong and I would order them again. Bags are 12 inches long .
I ordered these for my children to use in their cake decorating class. I didn't consider the size when I purchased them. They don't hold very much icing at all. If you are just using a bit for detail or want multiple bags for using several colors in smaller amounts, this is the bargain for you.
I really dislike buying feather weight bags because it might be because I do not know how to clean them properly or something like that because they end up smelling so I was really happy about finding this product. I really liked it and it worked really well. They are great because you can snip off the top and drop your tips in without needing a coupler. That means that these bags are only one tip per icing but if you dont mind that then you will be fine.
I love these. So much easier than trying to clean the reusable bags, and then the reusable bags get holes after a few months anyway. They are thick enough and worked very well.
I love these so much more than regular pastry bags. I hate having individual bags floating around so having them on a roll is a dream. The tacky plastic took a bit getting used to when trying to fill but overall it gets the job done. I do wish I got the larger ones as these are quite small and need to be refilled for larger projects but thats my fault.
I'm so happy I'm a cheapskate and scour until I find deals like this. I was going through a lot of bags (I'm cheap but also lazy and don't want to wash them and reuse them after each use). I found these way easier to use because you can actually grip them.Love them!! Extremely happy with purchase!
Answer: They are 12 inches long so they easily hold several cups.