I have been using the GG Uberlight 10L bag as my food bag for a while now. I line the inside with the LiteTrail NyloBarrier bags, for a total weight of 0.9 oz. For trips 3 days or less, this has been my go-to food bag set-up. For trips longer, or if I am just carrying more food I go with my ZPacks Blast food bag and a cut down LiteTrail Pack Liner (made from the same NyloBarrier material).
I would guess that the GG bagas are made from around 0.5 oz/sqyd cuben. They are completely taped/bonded. With use I have found a single small hole in the side of the bag (likely from the hard edges of the Packit Gourmet meals), which I fixed with a short piece of the single sided cuben tape from ZPacks. I just rounded the corners and it patched it up just fine. Other than this I do worry about the clip holding in the bag when hanging it full (around 8 lbs max, but more often 6 lbs or less).
I like this set-up, but once this one wears out, I don't see myself replacing the GG bag with another one. Instead, I will just pick up the medium dry sack from ZPacks. These use 1 oz/sqyd cuben and are considerably tougher, don't really weigh much more (0.85 vs 0.5) and are less expensive.