Many folks have long carried some duct tape for this purpose. I have carried cuben tape for many years http://www.theultralighthiker.com/wp-admin/post.php?post=1797&action=edit . I can attest that it successfully repaired a Neoair pad which had been relentlessly chewed by a certain puppy, and that the repair has held now for 3+ years! One of the virtues of this ‘new’ tape (apart from that it sticks to practically everything) is that it comes in rolls up to 3” (75mm) wide, Such a roll weighs 21 grams. It could easily be cut in half: https://www.mcnett.com/gearaid/tenacious-tape#10691
Additional Information
Length 500mm
Weight 21 grams
Color Clear, various
Width 75mm