Grocery containment system for last mile of order fulfillment

A cart assembly, comprising:

• (a) a cart comprises a platform, wheels, a push handle by which the cart assembly is manually pushed or pulled, and an electronic device attached to the handle by a mount;
• and
• (b) a container assembly removably supported on the platform of the cart;
• (c) wherein the container assembly comprises a crate and a liner removably received within and supported by walls of the crate;
• (d) wherein the liner comprises panels, each panel being defined by one or more exterior walls and one or more interior walls that define therebetween spaces containing a phase change material;
• (e) wherein the cart is configured to transition into a collapsed configuration for storage when not in use and the container assembly is removed from the platform;
• (f) wherein the crate is configured to transition into a collapsed configuration when not in use and the liner is removed, the crate being configured to stack on top of a second identical crate when the crates are in the collapsed configuration;
• and
• (g) wherein the liner is collapsible when not in use and removed from the crate.