There is not a lid provided with this kit. What you do is you slide the finishing trowel on the top after you put all the other attachments inside the storage box. The red button will pop up once you have slid the finishing trowel into the top. Then with the handle attached it is like a nice little carrying case. The finishing trowel is the one with out and notches on it. All for sides are straight.
Thank you for asking, Vic. Please check with the retail distributor Home Depot, possibly a local stores customer service desk. Home Depot handles all of the aspects of the retail distribution for the line of Hart products, which includes pricing, and on-line and in-store level item availability within their distribution system. They are to address all Hart product availability and distribution related inquiries. I hope this helps and we appreciate your interest in Hart! -Keri