If I recall correctly from the images I've seen, the Bobarra cover is significantly thicker than many, and I don't believe I've seen exact dimensions for it. Unfortunately, you probably should have let Melissa know what cover you used, along with the measurements, since the Bobarra isn't a commonly used cover like M-Edge or Oberon. Her bags are sized for the most common covers, typically the ones shown by Amazon on the accessories page. The original Kindle sleeve is actually smaller than the travel bag, so if you choose to purchase one, be sure to provide her with that info or you won't get the right fit.
Note too that the original bag is not designed to carry anything other than the Kindle itself as it does not have a pocket of any sort. With a smaller case, there's often room for another object (phone, glasses, etc.) but it's usually a pretty tight fit. It does have a bit less padding than the travel bag, so it feels less bulky.
I use the travel bag daily, even if I'm staying at home, to keep essentials nearby at all times. The original bag stores my power cables for the Kindle & iPhone; it only leaves the house when I fly (it's been great for keep the Kindle actually tethered to me on the plane--I'm a lot less inclined to do something careless like put the K2 in the rear seat pocket when I get up!)