Title says it all. Patch 3.1 will introduce a pattern for a 32-slot herb bag, obtainable at revered reputation with the walruses. It was about time. It seems us herbalists always get left behind when it comes to larger bags. Everyone was enjoying their 28-slot bag, while we were still carrying around the Cenarion Circle bag. Only far into TBC came Mycah's Botanical Bag.
Well now we finally get the 32-slot bag, a great while after every other profession got theirs ;)
Screenshot, Source