Getting Started Designing Flexible Wood Cuts

I don’t know what I want. At least I’m able to admit that. Say, I would like to make a perfectly round box/tray with the flexible strip around the bottom and ring around top to hold it steady. What’s the simplest way, online tool, generator etc…? Also please correct any proper terminology I may be using so I can do better google searches on topic.

Kind Regards,
Dean

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