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, (Hot Pink), 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: 26748356

Details

Brand
ROBOCUP
Color
Hot Pink
Material
UV Stabilized
Product Dimensions
9.02"L x x
Unit Count
1 Count

🎣Dual drink + fishing pole caddy

🛡️UV-stabilized, rust-proof build

🛥️Clamp fits surfaces up to 2”

¥13038

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

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Description

🚤 Stay hydrated, hands-free, and fully equipped—wherever your adventure takes you!

CLAMP ON CONVENIENCE - Instantly grips round or flat surfaces—no tools needed, no hassle.
PORTABLE VERSATILE - Perfect for boats, golf carts, strollers, beaches, and job sites—hydrate and organize anywhere.
MARINE GRADE DURABILITY - UV-stabilized polymer and stainless steel springs resist rust and harsh environments.
MULTIFUNCTIONAL STORAGE - Securely holds 2 drinks plus fishing rods, tools, phones, and more—stay organized on the move.
UPGRADED REINFORCEMENTS - Reinforced clamps and threaded end caps ensure a secure, long-lasting fit with optional accessory expansion.

The ROBOCUP Hot Pink is a patented, clamp-on boat cup holder designed for ultimate versatility and durability. It securely holds two drinks plus fishing poles, tools, and essentials with heavy-duty rubberized clamps that fit surfaces up to 2 inches. Made from UV-stabilized polymer and stainless steel hardware, it withstands marine environments and offers portable storage for boats, golf carts, strollers, and more. Backed by a 3-year warranty, this multifunctional caddy keeps you organized and hydrated on every outing.

Specifications

ASIN	B01B3MZ5NA
Automotive Fit Type	Universal Fit
Best Sellers Rank	#7,189 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #3 in Boat Cabin Storage
Brand Name	ROBOCUP
Color	Hot Pink
Customer Reviews	4.7 4.7 out of 5 stars (5,574)
Hand Orientation	both
Item Dimensions L x W x H	9.02"L x 4.49"W x 6.5"H
Item Weight	12.32 ounces
Manufacturer	RoboCup
Manufacturer Part Number	FBA_07-105-HP
Manufacturer Warranty Description	Backed by a 3 Year Limited Warranty. See web site for details or email [email protected]
Material Type	UV Stabilized Polymer
Model Number	FBA_07-105-HP
UPC	856341001028
Unit Count	1 Count

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¥13038

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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