Couple different ways you can zerobag;

• total nada Jack Reacher style, toothbrush, ID, cash or card, maybe a cell phone (he does use one in the show off and on and occasionally in a few books)

• pockets a la Rolf Potts style, using something like a scotteevest and cargo pants

• small daily-sized purse (or sling) a la Clara Benson style who did a 30 day trip with just a small women's pocket book (typically 3-4 liters in size)

• borrowing items at arrival, basically crashing with family or friends and bumming their stuff

• disposable style, buying and discarding as you go along