30 x 3 1/2 x 40" 1 Piece of 30 x 40" 4-Piece Mirror Boxes

4-piece corrugated mirror box system. Four identical panels interlock to form a complete telescoping carton, allowing the assembled depth to be adjusted to match the exact profile of the item being packaged — eliminating excess void fill and reducing movement during transit.

The adjustable-depth construction makes these panels a practical choice for movers, art shippers, glass distributors, and framing shops handling mirrors, framed artwork, canvas prints, glass panels, and similarly flat, fragile items. The telescoping fit keeps contents snug without requiring custom box procurement for every size variation.

Each panel is manufactured from ECT-32 kraft corrugated and printed with fragile, handle with care, and do not lay flat warnings to communicate proper handling at every stage. Panels ship flat to conserve storage space and are sold in bundles of 4. Each panel weighs approximately 0.685 lbs.