For years I used giant flat 2.5-gallon self-sealing plastic bags to sort the contents of my suitcase. EZPacking Travel Cubes provide a classier and more efficient organizing option.
The transparent and flexible vinyl zippered bags come in multisize sets of four or 12, or can be bought individually. Each cube (OK, cuboid) is trimmed with Cordura nylon in a choice of seven colors, with matching sewn-in handles.
Pick one color per four-piece set, but you can choose a mix of two colors for the 12-piece bundle. A family can color code each member's belongings.
I love that the contents of each sturdy bag are clearly visible and that everything stacks together neatly, without collapsing in a heap, as did my unevenly stuffed self-sealing plastic bags.