Thankfully, though we aren't sold on the swappable fascias, as a bag it's at least competent, featuring more than enough pockets and storage spaces for most. It even has a couple of nice practical touches that are actually quite desirable.
By far and away the best aspect is the secondary sleeve housed within the main body of the bag. This appears to be a sleeve, but has its own handles, zip sealed pockets and hook attachments for the shoulder strap making it more like a second and more lightweight bag, ideal for those occasions where you want your laptop and a few accompaniments without the bulk of the whole bag. It's also great for whipping out at meetings, saving the fuss of rummaging around in the bag for looking for smaller items.
Elsewhere on the main body of the bag there's plenty of space for all manner of things. On the back is a double ended compartment that could be used for magazines or folders with one end closed, but with both opened allows you to mount the MiBag onto a wheelie bag for lugging around airports and hotels. On the front, behind the main flap that's fastened by a fairly solid clasp, is a pocket with pen holders, a keyring and various other little spaces, with another small zipped pocket in front of this.
Behind these is another unsealed compartment that's slightly too shallow for a magazine, but there's some space left inside the main body for anything else that doesn't fit elsewhere. Overall, including the pockets on the secondary bag/sleeve, the MiBag in both its 13in and 17in versions, is well catered for in terms of storage.
Unfortunately, despite its ample storage options, the MiBag still doesn't quite convince. Its synthetic look and feel not only looks unpleasant but provides only a modicum of protection, while the shoulder strap is disappointing thanks to a thin and weedy feeling strap and a poor shoulder pad that's too small and lacks sufficient padding. This is a particular issue for the 17in version, which is likely to suffer most due to it being heavier by default and heavier once fully loaded.
All in all, it's hard to recommend the MiBag. Its gimmicky swappable fascias don't convince and while it has lots of nice storage spaces it lacks basics like a decent shoulder strap. The only consolation is the secondary bag inside, which is a neat idea and would be very much at home in a bag that's more attractive and better put together than this. Ultimately, there's plenty of choice out there in this sort of price range and the MiBag fails in too many ways to be a convincing candidate.