There's a few more devices coming out next month. I think the MVP3 might work for you depending on price and features. They've been tight-lipped about it but it's supposed to come out by Xmas. Most compact 18650 devices with toolless battery doors are going to be in the $200 range. The istick has a 2200mah battery that lasts a very long time and can be recharged with any microUSB cable so you can charge with your phone charger in your car. And it's cheap so you can get 2 if you vape that much.
*Edit - You didn't mention what you were going to use on this device. The istick fires hotter than normal because it uses Vavg (Mean) so some cartos don't work well with it.
I was going to wait till I decided on a device, then find out what would be the best carto (ohms) to use with it. I would love a dual coil bottom tank where I could just change the head when needed. But they all seems to have a leaking issue. I will give you some backround on my vaping. may help you help me.
I started about 4 years ago with the stick type batteries. Then went to the epower mech mod 14650. still have it and use it as my out and about with a 1.7 ohm xxl carto. About 5 months ago I purchased a coolfire 1, with a 18650 extenstion, using a 2.1 ohm carto on it. It came with a iclear 30s, which I did not like, it used double the juice in a day that I normally use, and was to airy. I use a 70/30 mix. Recently, I purchased an iclear 30B, love it, swiped out the drip tip because the draw was to tight, and now its perfect. Got me off the chain vaping (retired so easy to get into that mode). I used the head that came with it for 5 days, then I noticed the top of my device was wet, it was coming from the pin on the bottom of the head, the threads were dry as well as the bottom of the tank. Swiped out the head for a new one and it is doing the same thing unless I lay it down between vapes. It is annoying and I don't want to worry about ruining my device.
Sorry for the long answer