4 herb bag container items
The Forever catalog holds 4 herb bag container items, topping out at item level 65 with Satchel of Cenarius, Cenarion Herb Bag, Herb Pouch. Bags and profession bags, by slot count.
Source: the World of Warcraft: Forever beta client's item tables and Blizzard's Game Data API. Updated with each beta build.
Container · Herb Bag · page 1 of 1
 Satchel of Cenarius | Herb Bag | 65 | - |
 Cenarion Herb Bag | Herb Bag | 55 | - |
 Herb Pouch | Herb Bag | 20 | - |
 Apprentice's Herb Pouch | Herb Bag | 1 | - |