I'm using this system for my entire astronomy kit, the Milwaukee Packout:
There is a custom-cut foam available for the small tool box:
They also have a version of the small tool box with the foam already in it.
All these cases stack and lock together. The small tool box holds eyepieces, diagonals or finders (sorry I don't have a picture of this, but similar to the pic below of the mount head in the larger case). The medium case holds my mount head. The large wheeled case has everything else in it... flashlights, power supply, cords, vibration pads, cameras, wifi controller, level, etc. I can bungee my OTA case, tripod and observing chair to the stacked system and take everything from the car in one trip. I really love this system, it's a little pricey but very well put together and works like a charm.
Edited to add that you don't have to buy the 3 pc case set up front. They sell all these pieces separately, so I have two of the small tool boxes because I have a lot of finderscopes, diagonals and eyepieces to organize, and I want some in one case and some in the other, and then I just take whatever case is appropriate to my need.
They also even have a small cooler that attaches to the system that I purchased. The stack, even when fully loaded, is pretty easy to manage; the wheels are big and roll well over rocks and uneven ground. I'm older and not too strong and I love how easy it is to get it around.
I also use an Apache case for extra eyepieces. These are the ones you get at Harbor Freight and less expensive than the Pelican, but very similar. They are pretty decent quality and I've not had any issues with the ones I've purchased. They come with pick and pluck foam, which isn't my favorite because it doesn't hold up well over time, but you can get better foam to replace it on Amazon or elsewhere.
Edited by rajilina, 03 June 2020 - 09:57 AM.