I have not looked for a specific travel case, but unless you are being really rough with it I would say a padded envelope or a generic small case would do it. It's pretty sturdy. I take it to to the office sometimes and just put it in one of the pockets of my laptop case. Also, for extra protection against scratches I never removed the clear plastic film that comes over the screen. Except for the red ""pull here"" tab, you can't tell it's there. 

So long as it has a usb port there is no reason you could not. That being said, I have never directly powered any device from mine. I use it to charge my power banks and then use those to power other devices. Loss of a power bank because of spiked or fluctuating power (in and out of shadows, fast moving and intermittent cloud cover) may cause damage to devices that are directly connected. But, a power bank is a heck of a lot cheaper to replace. 

Yes, the height can be adjusted up or down by turning the adjustment knob. 

You don't have to collect the bracket. You can buy them directly. The packaging now contains the clip. If you encounter any problems during use or you are missing any accessories, please contact our after-sales staff. We will reply your problem as soon as possible and solve it. 

It does not come with a stand, just a background cloth and 4 spring clips.