I think is not about size, Not only Banco and Curved Air are bigger (in fact I have the Banco mini housed in the promo cover that is normal size) but also other like IF has lower size or Flower Travelling Band and Atomic Rooster have a bigger DU promo box because one mini of each has special cover size.

But we can´t include digipack in cardboard sleeve, I have a lot of these but I didn´t considere them mini lps. By example the Television ones that I have seen listed and auctioned sometimes as japanese mini lps, they aren´t and, in fact, they don´t reproduce exactly the original albums. In the same way we have some recent albums like the Arcade Fire "Funeral" or the excelent Renascent UK rereleases for The Sound or Comsat Angels. But aren´t mini lps, are jewel box sized in cardboard sleeve.

I think that we can´t include digipacks of any kind, style or material.

I have included myself a rare minilp, the PIL Metal Box, I did because is a reproduction of the original one in cd size, and it can´t be in other size, so for me fits here.