functional transparent only for order and documentation issues.
Maybe to carry the whole folder to or from the backpack?
Assignable colors + a name
Folder sizeable, with descriptive text to put on its surface. maybe +a list of the contained blocks
2 senarios:
1.) opening a folder opens a empty blockspace with only the assigned blocks in it, light backgroundcolor of the folders color
or
2.) opening a folder shows the folder-blocks in the standard blocks, They have folder-colored marking in their head. Maybe with an folderoption to group the blocks which can be distributed aorund the sheet near the folder symbol.
closing removes them from the sheet
just a suggestion