I'm not sure I understand the question. I guess I'd consider pretty much any charger that works with it to be portable. It's just the plug and the proper USB wire. I know when I travel I take several with me. At least 3 plugs and a selection of wires to charge my phone, tablet, kindle, etc.
I do also have a couple of battery pack type chargers, for if I need to charge something and there's no electrical receptacle. One is 'solar powered' so it will theoretically recharge itself in the sun. You can also recharge it the usual way. Either one can then be used to recharge a phone or something.