Just get some local hippies to make them out of hemp.I had actually considered netting and leather strap (like a classy pool table) cup holders for my portable tables, as they essentially take up zero room. Decided against it because they are less stable, and I found I strongly prefer slide-unders. But if anyone buys one of those folding portable tables with built in cup holders that are only 1" deep, this is a viable alternative if you retained any macrame skills from childhood.