The Ultra-Sil® Shopping Bag packs down into a tiny stuff sack (approximately 3” x 2”), small enough to fit on a key ring. Yet it is strong enough to carry well over 250 lbs (115kg). So – how is this possible?
The Ultra-Sil® Shopping Bag is made of a featherweight, high tech fabric. CORDURA® brand yarns are used for strength, and they are woven together very tightly – 240 threads per inch – for resilience. The fabric is then siliconized on both sides.
The silicone elastomer makes the fabric water resistant – but it also allows the individual fibers to stretch. In comparison, polyurethane coatings used on some ‘similar’ products do not stretch to the same degree: under load, they are more likely to break, which is how a tear starts.
Sea to Summit capitalizes on the unique properties of this fabric by reinforcing stress points using a zig-zag seam called a bartack. In addition, the handles of the Shopping Bag run through two seams at each attachment point.
The result is a bag (larger than conventional grocery bags) which will reliably carry your purchases year after year.
So – the answer to the question ‘paper or plastic’? is therefore ‘neither – I have an Ultra-Sil® Shopping Bag, thanks’.