98 bag container items
The Forever catalog holds 98 bag container items, topping out at item level 65 with Panther Hide Sack, Bottomless Bag, Bottomless Bag. Bags and profession bags, by slot count.
By quality: 73 common, 12 uncommon, 10 rare, 3 epic. Item levels run from 1 to 65, for characters from level 1 to 1. 39 bind when picked up and never reach the auction house; 59 can be listed.
The highest item levels here: Panther Hide Sack (65), Bottomless Bag (62), Bottomless Bag (62), A Reasonably Large Bag (60).
Professions make 18 of them: Tailoring (17), Leatherworking (1). The rest drop, are sold by vendors, or come from quests.
Source: World of Warcraft: Forever game data and Blizzard's Game Data API. Updated with each game build.