The Geekvape Aegis Legend is probably the most rugged and durable mod on the market. Is it indestructable? No. But it has been specifically designed to be able to withstand the most common physical abuses. There are several reviews on You Tube that show all kinds of abuse being given to the Legend.
Shockproof if dropped from less than 3 feet. Waterproof. Dustproof. The most vulnerable parts to a hard impact would be the screen and the battery door/batteries. All openings to the inside of the mod are secured by silicone plugs to allow it to be water proof; ie the USB port used for downloading firmware updates. I strongly advise against charging the batteries via the USB port because repeated removal/insertion of the plug could damage the silicone plug (although a spare plug is included).
I was given a Legend by Geekvape in exchange for doing a review. I used it exclusively for two weeks. I then gave mine to my son. Although I have relatively large hands, the Legend felt large and heavy in my hand. I personally prefer a more compact single battery mod.
JAC Vapor series B DNA75W I've got two of these JAC's and so far they have proven quite durable to normal everyday abuse.
My personal review of the Legend is combined with this review:
Aegis Legend Kit - Geekvape