See, the backpack doesn't disappear when you deploy the twin electric motors. It sits on the tail end of the board -- holding up to 35 liters of possessions while freeing up your body to keep balance as you carve up the sidewalk.
The actual board seems distressingly small at first, but when I planted my leg firmly against the big battery inside the backpack, the rigid support kept me from sliding off. Which is completely unlike my last few experiences with skateboards. (My poor tailbone.) You use a little wireless remote controller to speed up or slow down.
So what's the catch? There are quite a few. First, it makes for a pretty heavy backpack: The Movpak weighs 17 pounds (7.7 kg) empty. That's actually lighter than a lot of electric scooters, but it could definitely take a toll on your back if you plan to strap it there.
Second, the Movpak isn't for sale yet. It's an Indiegogo project looking for crowdfunding to help support the fledgling company. That means if you plop down $599 thinking you're getting a huge early-bird discount (it'll retail for $1,200, or about £840 or AU$1640 converted), there's a decent risk you'll lose all that cash if the company fails or can't produce the product.
Movpak actually tried and failed to raise $100,000 on Kickstarter a year and a half ago -- but Kickstarter refunds money if a goal isn't met. Indiegogo doesn't.
According to Cnet