Dimension: backpack: 12.6"x7.0"x16.9" (Length x Thickness x Height), lunch bag: 9.0"x6.3"x9.4" (Length x Thickness x Height).
Backpack details: fabric: polyester, lining: polyester.
One main pocket, one mid pocket, one front pocket and two side pockets.
Inner structure? The main pocket has an interlayer. The mid pocket has an interlayer and two slots for pen, pen case.
How about the straps? Ergonomics shape strap with soft sponge, it has waist strap.
What can hold? Book, textbook, iPad, laptop etc.
Lunch bag details: Fabric: Linen. Lining: Aluminum foil.
Function: thermal insulation, cold insulation.