Notice they're in marketing, they don't care about any of this ecological, practical or logistical nonsense, just think about how well this would sell!
so, we were selling these things last winter in Germany (Netto) and the net was made of actual string, don't ask exactly what, but it didn't feel like nylon or any other synthetic
Totally unrelated (to nuts): I feel that the prop masters of The Expanse did a stellar job of take away meal packaging. Even the utensils did double duty as the locking pins of the packaging.
It's not really evident from the series - I believe it's one of Adam Savage's videos you should check out, where he gets to talk to some of the prop masters.