There is a new line of Back up Batteries products that not only will recharge your smart phones but will run your laptops and even jump start your car. They really work (I use it). They are a little larger and heavier than the usual smartphone recharges but well worth their weight.
One such product is Halo Bolt which is available from Amazon. Make sure that you get the one with the 110 v outlet. They have different versions.
While this is not the most power storing back up (while they advertise it a 58,830 mWh unit, this is equivalent to around 16,000 mAh…a more accept measure of capacity), what is novel about this unit is that it has a 110 v output which I can use for my laptop.