A pretty simple 6" opening chest.
Shown here with eight 2-3/4" opening chests and a 1-1/4" opening chest.
Step 1: Nesting Chests/blocks
You can easily nest eight 2-3/4" chests/blocks inside the 6" opening chest.
You can also easily nest eight 1-2/5" chests/blocks inside each 2-3/4" opening chest.
This means you can store 64 1-1/4" chests/blocks inside each 6" opening chest.
Step 2: Printing and Folding
You'll need to print 3 copies of A-B, 1 copy of C, and 1 copy of D-E.
Fold along the dashed lines. Cut slits where indicated on C and D.
Glue the brown flaps indicated with the blue arrows (this just gives a little stiffness around the opening of the chest when it is assembled). Make sure to not glue where you cut the slit on C (or you won't be able to tuck the latch in).
Don't glue the white tabs yet.
Step 3: Assembling
Assemble the top by gluing three A's to D.
Assemble the bottom by gluing three B's to C.
Attach the bottom and the top by gluing each to E (glue E on the inside of the top and bottom).