This demonstrations are based on the travel hoop described here. A plain PEX hoop with no covering or wrapping:
Travel Hoop demo video
Bubble juice capacity for a plain hoop (Note: I ran out of room as I was backing up but you can see the difference in juice capacity by comparing all three hoop videos)
A PEX hoop with an optional ribbed sleeve:
Ribbed sleeve demonstration video
Ribbed sleeve option for any size hoop for increased bubble juice capacity. Note the difference in capacity comparing all three options shown
A hoop wrapped with some rayon mophead yarn:
Cord wrapped hoop demo video
Cord wrapped hoop using a rayon mophead cord demonstrating maximum bubble juice capacity
Further Notes[]
A wiki visitor (perhaps Burbrujo?) notes: "I have begun to wrap each section of my Travel Hoop while unassembled and attach each end with a zip (wire) tie. This way you do not have to re-wrap it everytime you reassemble it. (Note: Each wrap is approx one inch apart from the other)."