hey OP, may not be what you're looking for but a mech mod should serve you well; Sure it might not be waterproof or nothing but it will take all the knocks you can give it that's for sure. I use an SMPL when i am out and about topped off with a velocity rda at 0.2Ω. it kicks really hard
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dunno if you can see it, but mine has a ton of scratches on it, still kicks hard and has not failed me yet. I'm gonna get it wrapped with a purple carbon fiber sticker sometime this week to cover it up, it should look (hopefully) much nicer after this.