How do you make a portable ps2 ?

May be...

ok i assume you mean like putting it in a car and playing it in there? Well first, you need to by a cigarette lighter ac adapter for power (it has the prong outlets like in your wall in your home and you sitck it in the cigarette lighter). Then get like a portable dvd player and put your composite (red, yellow, and white cable) into the back of your dvd player. Boom, you can now play ps2 in the car.

Ben Heck has amde a few, if your into serious modding.

full how to in the link.

sell your ps2 and buy a PSP... that's the only way I see it.

get it and put it in a bag and take it somewhere

put it in a bag and carry it?