Recommended for ear ties are silicone rubber bands.
Grifiti Band Joes #18 Gauge Standard Silicone Bands Long Lasting Than Rubber Cooking Grade Heat Cold UV Chemical Resistant
Regular hair ties get the job done too.
Be well,
Faz
No Sewing Machine Needed
Japanese Creations
No-Sew Pleated Face Mask with Handkerchief and Hair Tie
No-Sew Pleated Face Mask with Handkerchief and Hair Tie