I don't even particularly like the idea of storing the hydratubes upright at all.
I envision some sorta smooth, semi-flexible cheap plastic frame the hydratube fits in (so it lays on its side but has a flat bottom so it can't roll away).
It would be even cooler if those locked together somehow so one could safely store a cube (or pyramid) of 9+ hydratubes.
For now a fairly easy do-it-yourself is to take 4 wine bottle corks and nail them into a board with them standing upright and spaced far apart enough for the hydratube to fit between them in pairs just spaced so they are just short of the length of the hydratube. Get drinking!
I'd be interested to hear the ideas of others about this, as it may not be a priority for the VX engineering team at the moment, may not be available for some time, and may (therefore) even incorporate some of your very own creativity.
Some will want a stand that is upright for while the unit is in use, but I can't think of a good, safe, practical way to store hydratubes upright without somethjng going into the GonG joint (which I dont like).
Maybe some sort of metal tripod with silicone pads that tighten with those screws that you can twist easily by hand.
Durable packaging that safely held the hydratube in both fashions and could permanantly store the cloud with its cord and a hydratube at some point would rock for cloud portability along with the travel tube.
Congratulations on the progress (from Progress).
Best wishes with the long-awaited release!