1.43 Cuben OK for Zip Sack?

Wanting to make a couple of these pouches like the kits RSBTR sells (one for me and one for the wife). I usually keep all my small misc. stuff in a gallon ziplock but they’re failing during my trips and I need the stuff in it to be protected from water. RSBTR sells their kits with Dyneema X but this seems like overkill to me so I was considering using 1.43 CF for weight savings and best water proofness. Think that material will hold up well? It will just have things like med stuff, phone, headlamp, toilet paper, so nothing too pointy. I’m not going to use hybrid cuben as for the weight, I might as well save a lot of $$ and just use either Dyneema or something like HyperD 300 (considered using HyperD in the first place).Thoughts on which direction I should go? I should add that I want to use mine as sort of a pack lid so it will be resting on top of my pack but it shouldn’t see a ton of abrasion up there. If it rains, I’ll either be wearing a poncho over everything or I’ll put the zipper pouch inside the pack in the event I’m wearing my rain jacket.