Sure thing :) It was a thread here on reddit (I think /r/aves)

Retractable Keychain, Heavy Duty... https://www.amazon.com/dp/B09GK5NJK7?ref=ppx_pop_mob_ap_share

and then you clip it to this: BlackRapid Tether Tab with... https://www.amazon.com/dp/B07B43RQ13?ref=ppx_pop_mob_ap_share