NOTE 2022 This interfacing has been in demand constantly for past 13+years, we suggest you pre-order when it is not in stock as we are experiencing worldwide issues with manufacturers. We typically bring in 30 bolts at a time and many are already pre-ordered. This product is undoubtedly one of the most used products by sewers, tailors, seamstress, and bag makers. We are hopeful to have stock arrive later in September for the busy Fall Season.
I use this in 100% of my bags. I might use it in different ways, but bar none, it is the most important interfacing in my stash. I fuse Shape Flex to every single pocket that I make. I fuse it to facings in garments. I for sure fuse it to an area around a zipper to help reinforce that area.
What Sara has to add - Shape Flex will make a quilt-weight cotton have the feel, once fused, of a decor-weight or canvas-weight fabric. It will give the fabric a bit of sturdiness. As with the previous interfacings, the rough tacky side should go against the wrong side of your fabric before ironing. It is perfect as a stand-alone interfacing if you are making a small pouch or other smaller accessory.