Re-use plastic bottle tops to tightly seal food bags. Cut off wide-mouth plastic bottle top just at crest. save the cap. slip over bag opening. top toward the open end. Fold bag over bottle mouth. cap with re-used bottle top. easy to seal and pour!
By the way, I HATE the newest, cutsie, pretentious word - "up cycle" - you're being creative and reusing what would otherwise be called JUNK/TRASH! Repurpose / recycle - just call it that! Up-cycle is putting lipstick on a pig!