The Ultra-Sil Shopping Bag is a small, reusable bag made of the same strong fabric we make our pack covers, compression sacks and stuff sacks from, so it's amazingly robust and durable. The stress points also have bar-tacked reinforced stitching so it can be filled to capacity week in, week out and still perform like new. And because the Ultra-Sil Shopping Bag is so compact and lightweight, you can stash it anywhere - it clips easily onto a key ring with the attached carabiner or it can tuck into a purse or a jacket pocket, so it's never out of reach. Not only very practical and environmentally friendly, Ultra-Sil Shopping Bag is super compact and lightweight. The tiny packed size fits easily on your key ring, in a jacket pocket or a purse. It’s also amazingly strong and durable, so you can fill it to capacity and not fear the bottom will drop out.