Quality:good Performance:good Appearance:good Bought the boot set for my Hydro Flask The bootie fits well and with a good height so that it doesn’t slip off easily. The carrier comes with a rubber ring that’s not elastic and thus is meant to fit specific cap size. I remove the ring and use the carrier which is adjustable. The carrier is made of strong material and is well woven. Solid and tight; should be able to carry large heavy tumblers.