Collapsible reusable dry or liquid storage containers

A method of transporting cargo carrying collapsible carts comprising the steps of:

• marking said carts with printed and/or electronically bar-coded identifiable indicia identifying a customer destination on each one of said carts;
• stacking said carts when filled by merchandise by placing circular rotating transporters mounted on a bottom panel of an upper cart in corresponding recesses in a top panel of a lower cart;
• loading or offloading stacks of said carts onto or from a bed of a vehicle by rolling said lower cart of each stack of carts up or down a ramp extending from an edge of said bed to a platform;
• unloading said merchandise from said carts after offloading said carts containing said merchandise associated with said printed and/or electronically bar-coded customer identifiable indicia, thereby obviating the need for use of cargo supporting pallets and associated mechanized fork lifts;
• and
• transporting empty carts by collapsing and stacking the collapsed carts by placing said circular rotating transporters of one collapsed cart onto said recesses of said top panel of another collapsed cart.
• each of said carts is comprised of two pairs of side panels connected to said bottom panel at fold lines, said top panel joined to a top edge of one of said side panels by a cover fold line, said top panel having one of said recesses adjacent each corner thereof said bottom panel having a metal frame supporting a circular rotating transporter adjacent each corner thereof;
• in an assembled configuration, said bottom and side panels extending upwardly forming a top opening, said top panel swiveling between a position closing said top opening and a position exposing said top opening;
• in a collapsed configuration, said side panels fold inwardly, and said top panel fold over said side panels, said folded panels forming a flat, compact assembly for stacking and storage wherein all of said panels fold within perimeter confines of said metal frame;
• and,
• said side panels having releasable attachments where side edges of said side panels meet, said respective releasable attachments each comprising one pair of facing side panels having elongated male members extending along and on both side edges, and another pair of alternating facing side panels having female molded channels along side edges adapted to receive said male members when said side panels are lifted upwardly to form an assembled configuration of said cart.