I was looking for something that would reduce 3 seperate bags into one case when rolling at the same time, robust. There were a few others in consideration: from Think Tank (expensive), Kata (expensive), Pelican (heavy) and a few others that I can't remember right now.
The Calumet was relatively cheaper than most of the models that I had looked at (US$178 or €169). Price was a major factor and that there was a Calumet store nearby for me to get some hands on time. Up close, it appears well built and strong. My only concern (for any bag of this nature) is the weight and whether those little nylon in-line type of wheels would stand up to rugged use of being shoved into cars and dropped onto concrete/Tarmac repeatedly. It's a lot to ask for from those tiny rollers. It's only a matter of time.
Up close, it's tall. (86cm/34"). There's a sensible handle on top , none on the sides and a grip/stand on the base. The grip handles have a velcro handle to make it a little easier on the hands with the weight these bags have loaded into them.
The wheels protrude from the body of the bag - meaning that little more space on the inside of the bag. The stand on the bottom is recessed for it to be an extra grip - very handy to pull it out of the trunk of a car.
The zipper runs around three sides of the bag. They look as if it might handle over stuffing the bag. The Zipper handles themselves have loops for a padlock - should you need one - though if anyone can run off with this bag fully loaded, you probably should question if you should tangle with them!
When you open the bag you see a padded lightweight board - which would seperate the stands from the lighting gear. The stands strap onto the board and protect the gear from the shifting that may occur when in transit. The lid isn't so deep to handle many stands thicker in nature - but I had intended to carry stands seperately to save on weight. The padded board is completely removeable. The net pocket on the lid has two compartments with one single zip runinng along the entire length of the bag. Anything in these pockets might have to survive being crushed by heavy stands - bring in direct contact with them.
The main compartment uses stiff velcro dividers for seperation. For my gear I seem to have a little room in each compartment left over so I stuff smaller items in to fill. The bag isn't deep enough for heads to stand up - I laid mine down flat.
All in all the whole package with a Ranger and two mono heads weighs around 29kg. That's hefty. With stands as well (which I won't) you'd be asking for back trouble. The bag is reinforced on the outside with tough plastic corners where needed and it's completely rigid in build. As mentioned before my concern will be those tiny nylon wheels shifting that amount of weight and how long they might last. My plan for this is for storage to car to studio and certainly not long distances over gravel and uneven surfaces.
For the price it's not bad at all. Over a longer period we will have to see how it holds up.