what size is the opening to hold a cup? what diameter cup can it hold?

The lower cup has no role in holding any cup. As for the upper cup, a 30oz YETI Rambler doesn't seat to the bottom of the cup. Only about 2/3 of the YETI tapered bottom, fits into the cup, so the Robo-Cup is holding it via friction fit, NOT because the cup ever properly seated on the bottom.

will it hold a red solo cup?

Yes it does and in addition we now also have available the RoboCup Plus as an add-on accessory which holds large sized drinks. Thank you. -- RoboCup Family

does it clamp onto a beach umbrella

Yes it will. It is very powerful and can be difficult to open widely to attach to larger diameter objects. it works on my beach umbrella, my favorite chair, and rolling tackle box. My umbrella is no larger than one inch diameter. It could be difficult for larger diameters, but I love it. Very durable.

Will it work on a bike?

Yes it does on the seat post and works great as a portable fishing rod holder.

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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ROBOCUP, (Orange & Black), Patented Clamp On Boat Cup Holder |Multifunction Dual Drink Caddy for Fishing Poles, Tools, Net, Gaff |Portable Storage for Boating, Beach, Umbrellas, Golf Carts, Strollers

Product ID: 45144572

Details

Brand
ROBOCUP
Color
Black & Orange
Hand Orientation
both
Material
UV Stabilized
Unit Count
1 Count

🍹Holds 2 drinks securely

🔧Rust-proof stainless steel springs

🛥️Clamp fits surfaces up to 2"

€ 71.95

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛥️ Stay hydrated, hands-free, and adventure-ready with RoboCup — the ultimate clamp-on caddy for pros who demand more.

CLAMP ON CONVENIENCE - Tool-free, instant grip on round or flat surfaces up to 2 inches—set it and forget it.
EXPANDABLE ECOSYSTEM - Upgrade with RoboCup accessories like Plus, Holster, and Plate to customize your setup and never run out of space.
DUAL DRINK GEAR CADDY - Keep two beverages plus fishing poles, tools, or your essentials organized and within arm’s reach.
MARINE GRADE DURABILITY - UV-stabilized polymer and stainless steel hardware resist rust and harsh environments for long-lasting use.
MULTIFUNCTIONAL STORAGE - Unscrew bottom caps for drainage or stash nets, gaffs, and more—versatility that adapts to your adventure.

The ROBOCUP is a patented, clamp-on dual drink holder designed for boats, golf carts, strollers, and more. Featuring heavy-duty rubberized clamps that fit surfaces up to 2 inches, it securely holds two drinks plus fishing poles, tools, and essentials. Made from UV-stabilized polymer with rust-resistant stainless steel springs, it’s built to withstand tough marine environments. Its multifunctional design includes removable drainage caps and compatibility with additional accessories, making it a versatile, portable storage solution for active professionals and outdoor enthusiasts.

Specifications

ASIN	B0748VBBMC
Automotive Fit Type	Universal Fit
Best Sellers Rank	#8,735 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #2 in Boat Cabin Storage
Brand Name	ROBOCUP
Capacity	2 cups
Color	Black & Orange
Customer Reviews	4.7 4.7 out of 5 stars (5,578)
Hand Orientation	both
Item Weight	14.4 ounces
Manufacturer	RoboCup
Manufacturer Part Number	07-116-OB
Material Type	UV Stabilized Polymer
Model Number	07-116-OB
Number of Packs	1
UPC	856341001165
Unit Count	1 Count

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