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FEND One Foldable Bike Helmet - Adult Mens and Womens Bike Helmet - Safety Certified for Bicycle Road Bike Scooter Cycling Commuter Helmet : Sports & Outdoors
This is perfect!
You can get it here!
This could work.
This company sells retractable glass covers for garages, gazebos, swimming pools, and other outdoor areas.
There’s a foldable version.
They exist!
https://japperformanceparts.co.uk/product/folding-car-garage/
You can buy this one!
Here’s one from Amazon
This foldable bike helmet easily fits into a bag, making it easy to carry.