what does it mean "too big to use with portable" oxygen machine?

Yes, I would think so. I use mine for the home unit, when I get up I put the cannula in the cover. That said depending what you carry you portable in it might work for you

Oxygen Nasal Cannula Protective Cover

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

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A$39

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Sold byAmazon AustraliaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛡️ Keep it clean, keep it fresh — your cannula’s new best friend!

COMPACT PORTABLE - Slim 4x2x2 inch dimensions make it easy to carry and store on the go.
TRUSTED HIGHLY RATED - Backed by US patents and a 4.4-star rating from 874 users, ensuring quality and reliability.
ECO FRIENDLY COST SAVING - Reusable and dishwasher safe, reducing waste and extending cannula lifespan.
PATENTED DESIGN FOR ULTIMATE HYGIENE - Keeps nasal prongs suspended, preventing contact with internal surfaces to avoid contamination.
PERFECT FIT FOR ALL STANDARD CANNULAS - Seamlessly fits nasal cannulas up to 2.5 inches wide for universal compatibility.

The Oxygen Nasal Cannula Protective Cover is a compact, patented storage solution designed to keep adult nasal cannulas hygienic and protected. Measuring just 4 x 2 x 2 inches, it fits all standard cannulas up to 2.5 inches wide. Its innovative design prevents prong contact with internal surfaces, is dishwasher safe for easy cleaning, and reusable to extend cannula life—making it an eco-friendly, cost-effective essential for oxygen therapy users.

Specifications

ASIN	B0BYLJ3VXV
ASIN	B0BYLJ3VXV
Best Sellers Rank	#115,701 in Health ( See Top 100 in Health ) #112 in Oxygen Therapy Products
Brand	Keystone Healthcare Innovations
Customer Reviews	4.4 4.4 out of 5 stars (874)
Customer reviews	4.4 4.4 out of 5 stars (874)
Date First Available	26 March 2023
Is Discontinued By Manufacturer	No
Item model number	NCC-A-WHT-01
Manufacturer	Keystone Healthcare Innovations
Product Dimensions	10.16 x 5.08 x 5.08 cm; 18 g
Units	1.0 Count
Weight	34 g

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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