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.Customs & duties included in the price

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(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: 2072607

Details

Brand
ROBOCUP
Color
Black
Hand Orientation
both
Material
UV Stabilized
Product Dimensions
9"L x 4.5"W x

🍹Holds 2 drinks securely

🔧Rust-proof stainless steel springs

🛥️Clamp fits surfaces up to 2"

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¥9716

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛥️ Stay hydrated, organized, and adventure-ready—no boat should be without a RoboCup!

EXPANDABLE SYSTEM - Compatible with RoboCup accessories like Plus, Holster, and Plate for personalized setups.
CLAMP ON CONVENIENCE - No tools needed—installs instantly on round or flat surfaces up to 2 inches thick.
DRAIN STORE SMARTLY - Removable end caps allow drainage and hidden storage for rods, nets, or essentials.
MARINE GRADE DURABILITY - UV-stabilized polymer and stainless steel hardware resist rust and harsh environments.
DUAL DRINK GEAR HOLDER - Securely holds 2 drinks plus fishing poles, tools, or marine gear for ultimate multitasking.

The ROBOCUP is a patented, clamp-on portable caddy designed for boating and outdoor enthusiasts. It securely holds two drinks and various gear using heavy-duty rubberized clamps that fit surfaces up to 2 inches thick. Made from UV-stabilized polymer with rust-resistant stainless steel springs, it withstands tough marine conditions. Its multifunctional design includes removable end caps for drainage and storage, making it perfect for boats, golf carts, and more. Backed by a US-based family business, RoboCup offers durable, versatile organization solutions that enhance your outdoor lifestyle.

Specifications

ASIN	B0065MYZGW
Automotive Fit Type	Universal Fit
Best Sellers Rank	#5,263 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #4 in Boat Cabin Storage
Brand	ROBOCUP
Brand Name	ROBOCUP
Color	Black
Customer Reviews	4.7 out of 5 stars 5,551 Reviews
Global Trade Identification Number	00733572077551, 00856341001011
Hand Orientation	both
Item Dimensions L x W x H	9"L x 4.5"W x 6.5"H
Item Weight	0.75 Pounds
Manufacturer	ROBOCUP
Manufacturer Part Number	07-101-B
Material	UV Stabilized Polymer
Material Type	UV Stabilized Polymer
Model Number	07-101-B
Product Dimensions	9"L x 4.5"W x 6.5"H
UPC	733572077551 856341001011
Unit Count	1.0 Count

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