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, (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
Material
UV Stabilized
Product Dimensions
9"L x 4.5"W x
Unit Count
1 Count

☀️UV-stabilized polymer for marine durability

⚙️Rust-proof stainless steel springs

🛥️Clamp fits surfaces up to 2”

AR$130939

Duties & taxes included

In stock

Sold byAmazon ArgentinaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛥️ Stay hydrated, organized, and ahead of the pack—wherever your adventure takes you.

CLAMP ON CONVENIENCE - Tool-free, instant grip on round or flat surfaces up to 2 inches—secure your essentials in seconds.
EXPANDABLE ECOSYSTEM - Upgrade with RoboCup accessories like Plus, Holster, and Plate for a fully customized setup.
DUAL DRINK GEAR CADDY - Holds 2 drinks plus fishing poles, tools, phones, and more—ultimate multitasking for active pros.
MARINE GRADE DURABILITY - Built with rust-resistant stainless steel and UV-stabilized polymer to withstand harsh outdoor conditions.
MULTIFUNCTIONAL STORAGE - Unscrew end caps for drainage and extra storage—perfect for fishing nets, gaffs, or beach gear.

The ROBOCUP is a patented, clamp-on dual drink holder designed for boats, golf carts, strollers, and more. Featuring tool-free installation, rust-proof stainless steel springs, and UV-stabilized polymer construction, it securely holds drinks and gear on surfaces up to 2 inches thick. Its multifunctional design includes drainage and storage options, making it a versatile accessory for outdoor enthusiasts and professionals alike.

Specifications

ASIN	B0065MYZGW
Automotive Fit Type	Universal Fit
Best Sellers Rank	#9,493 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #3 in Boat Cabin Storage
Brand Name	ROBOCUP
Color	Black
Customer Reviews	4.7 4.7 out of 5 stars (5,576)
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	12 ounces
Manufacturer	ROBOCUP
Manufacturer Part Number	07-101-B
Material Type	UV Stabilized Polymer
Model Number	07-101-B
Number of Packs	1
UPC	733572077551 856341001011
Unit Count	1 Count

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