Low cost storage/travel case
In my experience, the choices for suitable storage/travel cases for Adult collectors are somewhat limited and often rather costly for the most popular options. But I just found this on Amazon and thought it was worth sharing...
https://www.amazon.com/gp/product/B07TKHK95M/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
Looks like the perfect carrying case to carry 20 high-end racers in secure, padded comfort. For air travel, it's small enough to pack inside a carry-on bag and easy enough to quickly access and display to NTSA officials, since all of that metal will typically draw thier attention. Not a bad deal for $14.99.
GspeedR
Discussion
Looks nifty but already pointed out concerns are true. We'll all be intereseted in your review when it arrives.
I'd be afraid of that strap either damaging the wheels by forcing the car down or not being tight enough so that when I open it the cars all fall out and get damaged.
I'd personally prefer this one: www.amazon.com/gp/product/B001IYMCJO/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
Fits more cars and they all get their own little plastic box. Shove some bubble into each cars box for extra protection and you wont have to worry about them flipping around at all. You don't need to open it to show TSA. Definitely tape the box closed though for travel as the clasp isn't too strong.