Box with lid
Make two masu boxes and nest one over the other as a lid. For 15 cm paper, trim the base sheet to about 14.3 cm and leave the lid sheet at 15 cm. Adjust gently for your paper thickness.
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Before you begin
2 sheets · Square paper
15 × 15 cm
The lid uses a slightly larger sheet.
No scissors needed
This lesson is being checked for folding accuracy. It has not yet passed a physical fold-through review.
Step-by-step instructions
Read through the fold before you begin, or open any step in the folding viewer.
Choose two squares
Use two matching squares. Make the base sheet about five percent smaller than the lid sheet.
Look for: One square is slightly smaller.
See this fold
Guide the base
On the smaller square, fold and unfold in half in both directions.
Look for: The guides cross at the center.
See this fold
Bring in the base corners
Fold all four corners to the center, then rotate the smaller square so its edges are level.
Look for: Four flaps meet without overlapping.
See this fold
Guide the base walls
Fold each edge to the center and reopen, one edge at a time.
Look for: A small central square marks the floor.
See this fold
Open the base ends
Unfold two opposite corner flaps. Lift the two remaining sides along their wall guides.
Look for: Two walls stand with open pointed ends.
See this fold
Close the base
Bring the diagonal corners inward at each end. Fold the end flaps over the walls and down into the floor.
Look for: The smaller masu box is complete.
See this fold
Guide the lid
Take the larger square. Fold and unfold across both centers, then bring its four corners to the middle. Rotate it so the edges are level.
Look for: The lid starts just like the base.
See this fold
Mark the lid walls
Fold each edge to the center and reopen.
Look for: Four wall guides surround the lid’s floor.
See this fold
Raise the lid walls
Open two opposite flaps and lift the remaining sides.
Look for: Two walls are standing.
See this fold
Close the lid ends
Tuck the diagonal corners inward and fold both end flaps over their walls.
Look for: A second, slightly larger box is complete.
See this fold
Bring them together
Turn the larger box upside down and place it gently over the base.
Look for: The lid slides over the base without forcing the corners.
See this fold