[ One size | 30*40 double-layer single-row compartment with 6 instrument pockets ]

[ One size | 30*40 double-layered double-row lattice  12 instrument pockets ]

[ One size | 40*50 double-layer single-row lattice  10 instrument pockets ]

[ One size | 40*50 double-layer double-row lattice  20 instrument pockets ]