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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ROBOCUP, (Red & 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: 45144569

Details

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

⚓UV-stabilized, rust-proof marine-grade build

🥤Dual drink capacity for ultimate hydration

🛠️Patented clamp grips up to 2” surfaces

€ 71.91

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Sold byAmazon SlovakiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚓ Stay Clamped, Stay Ready: The Ultimate Dual Drink & Gear Caddy for Every Adventure

DOUBLE HYDRATION HUB - Securely holds two drinks plus fishing poles, tools, or gadgets—stay refreshed and organized on the move.
EXPANDABLE ECOSYSTEM - Upgrade with RoboCup accessories like Plus, Holster, and Plate to customize your ultimate outdoor setup.
CLAMP GO CONVENIENCE - Tool-free, instant clamp-on design fits round & flat surfaces up to 2” for effortless setup anywhere.
MARINE GRADE DURABILITY - Crafted with UV-stabilized polymer and stainless steel springs to resist rust and harsh outdoor elements.
MULTIFUNCTIONAL STORAGE - Bottom end caps unscrew for drainage and extra storage—perfect for nets, gaffs, or your essentials.

The ROBOCUP is a patented, clamp-on dual drink holder designed for versatile outdoor use—from boats to golf carts. Featuring a tool-free clamp that fits surfaces up to 2 inches, it combines durable UV-stabilized polymer and rust-resistant stainless steel hardware for marine-grade longevity. Beyond drinks, it stores fishing poles, tools, and essentials with easy drainage and expandable accessory options, making it the must-have organizer for active professionals who demand convenience and rugged style.

Specifications

ASIN	B0748NFVJX
Automotive Fit Type	Universal Fit
Best Sellers Rank	#8,761 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #3 in Boat Cabin Storage
Brand Name	ROBOCUP
Capacity	2 cups
Color	Black & Red
Customer Reviews	4.7 4.7 out of 5 stars (5,578)
Hand Orientation	both
Manufacturer	RoboCup
Manufacturer Part Number	07-115-RB
Material Type	UV Stabilized Polymer
Model Number	07-115-RB
UPC	856341001158
Unit Count	1 Count

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€ 71.91

Duties & taxes included

In stock

Sold byAmazon SlovakiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Slovakia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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