Sennheiser SoundProtex Earplugs - Reusable Hearing Protection with 2 Interchangeable Filters - High Fidelity Sound at a Safe Volume Level - Black Grey https://a.co/d/8JmZwU8
Personally I have “loop experience plus” which I also got for $40 and wanted to compare the two. I’ve used them at concerts and love it
Loop Experience Plus Earplugs - High Fidelity Hearing Protection for Musicians, DJs, Festivals, Concerts and Nightlife – 18dB & NRR 7 Noise Reduction Ear Plugs – Extra Accessories Incl - Silver https://a.co/d/eQCjaD6
Small version with 2 different filters ~40€, big version with 4 different filters ~80€. All come without any kind of carry case / pouch. A bit expensive and lacking for that price tbh