Gotta go fast? Speed fiends might be interested to discover that there's a new bag in The War Within Alpha that increases movement speed in outdoor areas of Khaz Algar!
While increasing outdoor movement speed in a specific area of the expansion isn't a particularly important bonus, Arathor Courier's Satchel stands out as the first of its kind — no other bag in WoW has had this kind of statistical effect, and it could be a test case for more varied bag bonuses going forward. Although it is unlikely that we'll see universal combat enhancements like increased strength, critical strike chance, or damage procs, there are a number of other minor supplementary effects or effects that only work in specific areas of the game, like an excavators satchel increasing capabilities in Delves.
This could even be an interesting pivot for Tailoring, as bag sizes continue to increase with each passing expansion, being able to add special effects onto bags instead of continually increasing their raw capacity might be a compelling lateral movement to help curb that inflation.
Another point of interest is that while the bag is unique-equipped, it is bound to your Warband, which means it can be freely shared between all characters on your Warband (the new version of Bind-on-Account). This account-wide everything system comes with a variety of features including this type of transferable gear for alts, a guild-like cross Warband bank, shared transmog collections, achievements, and more.
Can we just agree to call it Warbound?