This is an exact duplicate of the case that is included in the 100 kit. I purchased this to hold additional filters.

As others said, this is very well made holder custom made for 150x170 and S5 filter holder round filters. I think it will also fit S6 holder rounder filters. The fit is tight, the lining is soft, and the overall bulk and design is such that there is enough intrinsic rigidity to protect individual filters. It should be fine to carry this bag in a larger backpack or drop on thee ground but it may not afford enough protection if you step on it. The tripod strap is included, it is needed. The top accessory pocket is nice to have a microfiber cloth handy, but you can't fit much more there.
There are some shortcomings:
1. The shoulder strap is oddly attached (on the back) so the holder is tilted on the strap, but it is Ok as it rests against your body.
2. There is no space to carry a optional adapter for a different lens (e.g. Nikkor 14-24mm), but one adapter can be fit inside S5 holder.
3. It would be nice to have an extra pocket for step-up filter rings but
you can fit it them in the compartment for S5 holder or instead of one round filter since rings are thin.
Overall, this holder is highly recommended to carry several 150x150 or 150x170mm and round filters, S5/6 filter system, custom lens adapter and step-up filter rings all in one place to avoid being distracted and dropping a filter accidentally. The bag is quite bulky (I had to carry it on the top of my photo backpack) and on the expensive side, but It is needed investment for an expensive filter system.

I definitely would recommend this case to protect your investment of your filters. The leather case your filters come with is not enough protection. This case fits nice in my f/stop mountain series bag.

Keep my glimmer and promist 4 x 5.65 sets in here, safe and secure.

NISI Caddy for S5 Filter Holder and filters is well made and puts the filter holder, circular polarizer, cap, and filters on your shoulder, and at your finger tips. I would love for NISI to make a double wide holder that would provide room for holding a second filter holder and additional filters/a wider selection of neutral density and variable neutral density filters. Pockets that are deep enough to hold the 150mmX170mm filters would be great. This would eliminate the need of having two caddies hanging on your neck and provide the proper filter holder and the proper filter in one area at your fingertips. Thank you B&H for making NISI products available and delivering on time.

Well constructed and durable. It's a definite plus being able to carry the large and bulky S5 Filter Holder and grad filters all in one case.