The device is comprised of a cooler body designed for variable size and capacity, optimized with insulating materials for effective temperature retention. The body incorporates at least one drain valve for liquid removal, optional wheels suited for diverse terrains, and a variety of handle types to support portability. The lid, attached via durable hinges, is similarly insulated and features a locking mechanism for security. Additionally, the lid or body may include a writing surface or a transparent receiving area, which holds and protects indicia-bearing cards for easy identification. The writing surface can be permanently or removably attached, allowing user customization, while the receiving area is UV-resistant to preserve card information.

The device is comprised of a cooler body designed for variable size and capacity, optimized with insulating materials for effective temperature retention. The body incorporates at least one drain valve for liquid removal, optional wheels suited for diverse terrains, and a variety of handle types to support portability. The lid, attached via durable hinges, is similarly insulated and features a locking mechanism for security. Additionally, the lid or body may include a writing surface or a transparent receiving area, which holds and protects indicia-bearing cards for easy identification. The writing surface can be permanently or removably attached, allowing user customization, while the receiving area is UV-resistant to preserve card information.

Disclosed is a multifunctional jigsaw puzzle board for children, including a jigsaw puzzle board body and a storage box; the jigsaw puzzle board body has an overall rectangular shape, a front of the jigsaw puzzle board body is provided with a jigsaw puzzle area for assembling jigsaw puzzle pieces, a rear of the jigsaw puzzle board body is provided with a chalkboard area for chalkboard writing, and the jigsaw puzzle board body is further provided with a mounting slot that opens outward; a support stand is foldably arranged on a side of the jigsaw puzzle board body; and the storage box is slidably arranged in the mounting slot and can be pulled outward, and the storage box is provided with a storage compartment for holding various items. The product perfectly combines jigsaw puzzle function and blackboard-writing function, and is convenient for use and storage.