I use the zippered plastic bags that blankets come in.

I made myself a huge bag using Jenny Doan's pattern that calls for Jelly rolls. She has a video of it on utube.. It is quick and easy... You don't have to use a jelly roll, you could use up strips from your stash...

I understand wanting to have some type of carrier to put a quilt in. Not sure I would take a king size quilt to someone's home to do hand work unless they have a very large living room.

I don't do what you are planning very often, but I have a large Vera Bradley bag that would accommodate a quilt and it has little interior pockets that will keep needed tools handy. I don't know the name of this sized bag but it I use it for over night or week-end traveling. Really any hand bag will do. I like the pillow case idea. Hand not thought about that.

Some of the ladies in our guild have made those Fat Quarter bags to carry large quilts. With the elastic on the sides it is easy to use and almost opens flat. The pattern is on the internet and it is free. Takes 6 FQs and lining.

I made muself a Fat Quarter Bag, pattern my M'Lissa Rae Hawley. Spelling may be wrong. I have made several as gifts. Each bag needs six fat quarters and some yardage. They are perfect for hauling large quilts to guild for show and tell.

I made myself a Fat Quarter Bag, pattern by M'Liss Rae Hawley, using six fat quarters and some yardage for lining and handles. It is perfect for hauling large quilts for hand sewing or show and tell. I have also made a few for gifts.

Wal-Mart and sometimes Big Lots have Picnic Baskets which are really great for taking quilting to other places.
I don't have one yet, as I haven't been in either store when they had them out.
Look in the Housewares Dept. at W.M. can't say at Big Lots.Hope I get there when they have them out this Spring!!
Mariah

i found a fabric/canvas laundry basket/hamper at TJ Max - spent $10 maybe. I often quilt queen and king size quilts, so this is a great size.

Besides the trash bag being mistaken for trash, I think some of them have deodorants and antibacterial properties. Who knows what those chemicals do to a quilt.