My gear has been all over the world many times in checked baggage. I don't subscribe to the idea that advertising you have scuba gear makes it a target for theft. To the contrary, Scuba gear is large, cumbersome and needs a specialist market to dispose of. Most thefts are opportunist needing to move the items on for money fast.
My gear once went to thailand in a heavy duty mesh bag, and got there safely
My regs go in a soft case inside my bag generally padded by a wetsuit. again no issues ever.
I have teh Mares Cruise bag. I don't like it and can't recommend it. For sure it has load of room. The exterior pockts on teh side hold fins, the two from pockets are deep but shallow so never get used.
The exterior material, doesn't hold up to travel well, mine has tears. While it's a great roller on a smooth level surface, its unstable and hard work on something uneven
I'm tempted by the SthalSac either the Caicos Cargo pack or the Steel 34. I'm really fussy about bags and the practicality so I'd want to see and touch one rather than buy blind over the internet with the fuss of returning.
For local diving I use an
XS Scuba Delux mesh duffel Both my wife and I use them. Ours get used weekly and are about 2 years old. They do hold a full gear set (not dry suit) and take abuse. The internal rubberised coating has come off the internal pocket, perhaps that due to heat here. both main bag zips broke - teh end stops cam off, this was easily fixed with a zip tie and has worked well (better than the original end stop)