That's brilliant! I love when everyday items double as storage space. Unfortunately my doors don't have that gap to tuck the tubes into.
For now, I cut some 1-1/4 PVC to 42" and installed caps at both ends. One end has a wadded paper towel stuffed inside the cap to collect the drips. The pipe holds all four of the tubes and sets in the corner. At some point I plan to mount it horizontally above the door, unless I see someone else's storage idea that will work better in my garage.
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