Large spool of seemingly heavy duty thread/twine/string. Possibly

New brothread - 30 Options - Large Cones of 5500Y (5000M) Each All Pur

Samson Zing It Rope (25 Feet)

Heavy Duty Sewing String Tread Spools.

Heavy Duty Thread String Large Spool for Leather, Canvas, Furniture Stitching - appx 750g (Brown)

This bag closing thread is 100% polyester so there is less 'fluff' residue to clog up the bag closer than a poly-cotton blend. Polyester thread will also hold up better outdoors.

Hal Heavy Duty Spool Sewing Thread for Bags Stitcher Closer 3600 ft (6 Rolls)

Kite String - Good Info Plus A General Ramble

Overlocking Thread Spool Sewing Machine Polyester Strong Thick Embroidery 180Mtr

Large spool of seemingly heavy duty thread/twine/string. Possibly nylon or polymer. : r/Whatisthis

Kite String - Good Info Plus A General Ramble

twined rag rug 'how to' permaculture textile techniques

100% Heavy Duty Thread Package of 6 Rolls 3800 Ft x Roll Roll Weight: 8.5 oz (0.53 lbs)

Heavy Duty Spool Sewing Thread for Bags Stitcher Closer 3600 ft (6 Rolls)

twined rag rug 'how to' permaculture textile techniques

Parcel Twine Nylon Ball 225ft

Atlas Insider: The Long and Winding Road – Modern Daily Knitting

6 Heavy Duty GUTERMANN 100% Polyester Topstitching Thread 33 yard spools - Helia Beer Co

Heavy Duty Sewing String Tread Spools. Size of the spool - appx 750g. Strong All Purpose - leather, canvas, furniter stitching polyester

Heavy Duty Thread String Large Spool for Leather, Canvas, Furniture Stitching - appx 750g (Brown)