See if you can find some food grade silicone sealer. Even with the Seam Grip, you are only being exposed to a tiny surface area with a pinhole. You'll suck in more chemicals at MacDonalds or breathing smog on the way to the trailhead, let alone what is in your dehydrated meals, smearing yourself with DEET or sunscreen.
They have discovered Teflon in polar bears-- you can run, but you can't hide. Seal your bag and go for a hike :)