If I am doing an interior, I just use the heaviest light stands that I have, excluding the C-stands. Since wind is not a factor, the heavy stands are not required. I rarely would use the B1's inside though, just for the largest of interiors. I have 5x600EX RT's which do the job 99% of the time.
If I use the B1 and a C-stand, it's gonna stay put for a bit. If I have to move them, yes, it's a hassle. They break down pretty quick though. A couple of clamps loosened and it's good to go.
This is the bag that I bought:
It's no Think Tank, but it does the job. I can get the collapsed turtle bases and columns in there (x2) to roll around. Without the C-stands, it holds @6 light stands, 4 umbrellas and many cold shoes and umbrella adapters. I have even sneaked some tripods in there at times. It's heavy, it sags a bit, but it does have some reinforcing ribbing on the underside.
I have several gear bags and through the years, I have traded in my backpacks for wheeled cases. You will never go wrong as long as you spend big on these. I thought that the Slinger was bargain. A couple hundred bucks and two years of service. I thought that they would have blown apart by now. They have zero signs of wear They sag a bit under weight, but so do I
The reinforced bars on the bottom side are holding strong, surprisingly. They even fit across the top of a luggage dolly when I;m shooting in hotels. I hijack a dolly for the whole day when I shoot for a hotel lol.
Keep questions coming please. I just want to save you all money that I spent on all of my mistakes. I have no affiliate links to offer, so I am making zero $ from this advice.