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Hey KQ: You're trying to store "stuff" not cups. Me too. I have cupholders ... with cups in 'em! I replaced the cheap shallow plastic Whaler cupholders with Stainless stepped deeper ones from Amazon.

But for storage, I was still short. I tried this cargo net bag, tied at the top to a side rail, and the bottom ties, I attached to huge suction cups. I've only just put this on my boat, but on the trial run it was great. We stuffed my VHF handheld, sunglasses, and empty candy wrappers in it ... all held nicely, no shifting, etc. I'm gonna grab another one, they're so unobtrusive and handy!

https://www.amazon.com/gp/product/B00OY9MOJS/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

Hope this helps your storage quest.