All metal or nearly all metal cartotanks like the Big Daddy or Lil Moma tanks from
Big Daddy Vapor are probably the most durable cartotanks I've come across. Anodized aluminum with a small window to see your juice level. Should you decide on these, be sure to get the Slap Yo Moma tank accessory tool, too.
If you want to go the clearomizer/clearotank route, the Tatroe Tank from
Tatroe Mods at Cigtech are similar to the Kanger Pro Tanks but are made entirely of stainless steel. Pretty indestructable.
As far as the battery device, you won't find a more durable VV mod than a Provari. Even should you be able to break one, the manufacturer will repair it free of charge during the one year warranty, or after warranty for reasonable repair cost for as long as you own the Provari. (You won't be able to do that with any Chinese-made mod.) Repair time and return is typically one week.

Provari's with cartotanks from Big Daddy Vapor