Thats a cool design! I have been through a ton of funnels over the years and hated all of them for one reason or another. Found this funnel a few years ago and I love it. I keep a piece of wire on the handle to hold it in place for certain jobs. Cleans great with brake parts cleaner. Flexible but doesnt collapse.
https://www.amazon.com/dp/B093X2Z41M?ref_=ppx_hzsearch_conn_dt_b_fed_asin_ti tle_2&th=1
Link not working....flexall funnel on Amazon