Dear friends, type 1 & type 2 is L Size, and type 3 & type 4 is XL Size. But type 1 & type 3 is single layer, only type 2 & type 4 is double-layers structure. Please pay atterntion.StyleBussiness, CasualMaterialOxford Cloth + PU LeatherFeaturesDIY Collection / with a string bag / high-quality handle..