The tin is the final determining factor of length. Folders have the advantage, but have bulky handles.I looked at blade blanks, essntially skeleton handles. To get anything reasonable the kit itself needed to be larger again in length. I concluded a very small knife could be included, but a truly secure sheath knife should be carried. Presently there is a tiny Buck folder in my pocket tin, puukko on neck, Cold Steel SRK on belt, ULU and additional Moras in my rucksack.