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.

Robocup Black | Desertcart SINGAPORE

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Sold byAmazon SINGAPOREDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚤 Stay hydrated, organized, and ahead of the pack with the ultimate clamp-on caddy!

EXPANDABLE ECOSYSTEM - Upgrade with RoboCup accessories like Plus, Holster, and Plate to customize your setup and never miss a beat.
MARINE GRADE DURABILITY - UV-stabilized polymer and stainless steel hardware resist rust and harsh environments for long-lasting use.
MULTIFUNCTIONAL STORAGE - Unscrew bottom end caps for drainage and extra storage—perfect for nets, gaffs, and more.
DUAL DRINK GEAR MASTER - Securely holds 2 drinks plus fishing poles, tools, and essentials for ultimate convenience on the go.
CLAMP ON NO TOOLS NEEDED - Powerful rubberized clamps attach instantly to round or flat surfaces up to 2”—no tools, no hassle.

The ROBOCUP is a patented, portable clamp-on cup holder designed for boats, golf carts, strollers, and more. It securely holds two drinks plus fishing poles and tools, clamps instantly without tools to surfaces up to 2 inches, and features rustproof stainless steel springs and UV-stabilized polymer for marine-grade durability. Its multifunctional design includes drainage and storage options, with upgradeable accessories to tailor your setup. A top-rated, versatile solution for active professionals who demand convenience and reliability on the move.

Specifications

ASIN	B0065MYZGW
Automotive Fit Type	Universal Fit
Best Sellers Rank	#12,959 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #2 in Boat Cabin Storage
Brand	ROBOCUP
Brand Name	ROBOCUP
Color	Black
Customer Reviews	4.7 out of 5 stars 5,593 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	12 ounces
Manufacturer	ROBOCUP
Manufacturer Part Number	07-101-B
Material	UV Stabilized Polymer
Material Type	UV Stabilized Polymer
Model Number	07-101-B
Number of Packs	1
Product Dimensions	9"L x 4.5"W x 6.5"H
UPC	733572077551 856341001011
Unit Count	1 Count

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