If you do put textures in the mylevel package you can make some serious file size reductions by going through the mylevel package in the texture browser and compressing all the textures to DXT1 DONT do it for the terrain heightmap - thats the G16 format texture. DONT do it for any RGB8 terrain/deco layer textures. DONT do it if the texture is part of a shader or material that requires the texture in a particular format. DO compress simple single layer textures that form walls, trees, basic stuctures etc. Setting the compression on the lightmaps in the build options to DTX1 will reduce the size of the lightmaps at the expense of shadow detail. I reduced a map (orel) from 85MB to 30 by compressing all the relevent textures.