For the little BD Betalite I have.
The fabric loops are simply two layers of silnylon stitched into the seam held by a couple of rows of triple straight stitching. I think I need to buy some much lighter guy lines to use with this little bivvy tent.
The lightest cord I have is some Lawson Glo-Wire from TierGear and I'm wondering what I should look at getting
The Megalite has much stronger loop attachments so I was also wondering if I should re-sew these with better tape and attached small line-locks