Although I appreciate that this case comes free with the Flak Jacket, that is also the reason I do not return it. If I had payd good money, I would have.
Off course the shell is sturdy enough to protect you precious glasses. But the fitting of the Flak Jacket into the slots is just not good enough. Maybe the XLJ version of the Flak Jacket does fit better, but the normal lens only slides in a few millimeters. In my opinion this is due to two things.
One, with the earstems folded, there simply isn't enough lens to put into the slot.
Two, the fact that the slots are on a 90 degrees angle from the surface down and the lenses are on a slightly smaller angle from the frame.
These two make it a non-perfect fit. The glasses are not loose and shaking because there's enough soft foam on the top to prevent this, so it is not bad for your glasses.
For the Half Jacket this is goes as well, although they fit better. Because once folded, there's more lens left to fill the slots.
Furthermore, because you're lenses only fill the slots for a few millimeter, the size of the bottom part of this case is a bit overkill. There's a couple of centimeters (inches) unused, which in my opinion is a waste of space in bag or pocket.
Overall I prefer the Medium Soft Vault for the safekeeping of my Flak Jacket and Half Jacket.

I have no issues with the case itself and the way it protects the contents from impact. My complaint is in the way the glasses and spare lenses fit in the respective slots. The glasses and spare lenses do not fit right. The slots are too small for lenses. I had to modify my case. I think OAKLEY might just be using the same case as manufactured for the HALF JACKET.

I am not overly impressed with this vault. I find that the cutout foam insert with lens slots is made of a very stiff foam. This I find puts you into the position of having to force your shades into the slots rather than them fitting nicely. I also found that the curve of the slot does not match the curve of my lens. Oakley could have spent a bit more time refining the vault.
However it does protect from bumps and bangs. Still does not impress me enough to use it.

Very cool case. They come 'free' with Flak Jackets. The outer is pretty solid, you cannot bend it. Doubt it would hold up with alot of weight on it though. Holds the glasses very firmly in place with foam. There is also room for extra lenses. And you also have room to store a microbag in there. Loved it so much I went and bought a Soft Vault for my Juliets! Yes, I feel for the 'free' ploy hook, line, and sinker.

i own half jackets i bought them about 2 yrs ago i take pride in how perfect i keep them ive been wanting a case for a while i bought another pair same style different colors and two cases while wating for the glasses the cases came in i loved it but after only a few days the case started to scratch the lenses on the inside bottom the case has a hard piece inside that the glasses rub on every time you put them in or take em out new lenses were 95.00 but good news oakley rep said there sorry DONT BUY THIS if you love your glasses

Color: Black

Comes free with every Flak Jacket and does the purpose of keeping your Oakleys safe. There is also extra space for two pairs of spare lenses. But the thick foam in the upper part seems a bit unnecessary and the case could be a lot thiner with less of it.

Color: Black

Does the same for my Custom Flak Jackets as it does for my Half Jackets, keeps them safe. Like any of the cases, a small worthy investment to protect a bigger .

the slots are especially tight on prescription lens. The slots are easy to modify though with an exacto knife.

awesome case, does what it is supposed to do. My FJs were dropped down the stairs in this case and they were absolutely fine. I have two of these, one that came with my HJs i got a few years back, and one i got with my FJs less than a year ago. The internal design of the case has changed a bit, there is now a larger opening in the back to make room for the larger earstems of the Flak Jacket, which makes for a better fit for both models. The bottom foam seems rough, but in my experience it has never been an issue with scuffing lenses. The top foam is a little overkill, but i assume there is a reason behind it such as impact protection.

The Flak Jacket case incorporates an ingenious yet simple principle to selling Oakley eyewear: the inclusion of a true protective shell which also allows for storage of additional lenses. While the outside of the case provides both a durable and rigid shield for your eyewear, the inside protects your glasses with a soft and supple environment. A metal icon also adorns the outside, completing the case.

I have two of these cases since I have two pairs of Flaks. Eh, this case was designed around the Half Jacket with standard lens since this glass fits this case perfectly. Its probably even safe to fit two pairs of the half jacket replacement lenses as well. However, your Flak Jacket XLJ must be bent/flexed into the case to make em fit. I really don't like this. I don't even dare keep any of my replacement flak jacket lenses in the slots, as they would probably pop out and float around the case during transport, hence becoming scratched. It was designed around the Half Jacket, and the Flak Jacket (which was supposed to be called Half Jacket 2.0) happens to fit 80% well, so they decided no need for a redesign. If anything, this stupid case sorta disuades me from purchasing anymore pairs of Flak Jackets since we all know that the $25 is built into the price the $140 retail for Flak.

Works well. The only issue I've ever had was that your microbag won't fit very well with two extra pairs of lenses. Seems as though there is way too much foam padding on the top of the case, and the entire case could be slimmed down and still function just fine.

I don't think the case fits too well with the Flak or HJs. I've tried both of them with the case. I'm actually worried about scuffing my new lenses when forcing it down into the foam lens slots when i need to close the case. The foam is pretty hard, seems a bit rough, and through experience, normal (non-iridium) lenses can scratch quite easily. But then again, my current lenses are black iridium, but still... Design can be improved.