How to create a Assetbundle of low size

Hi every body.

Actually i use this for creating assetbundles:

   [MenuItem("AssetBundle/Build AssetBundles Prototipo")]
    static void BuildAllAssetBundles() {

        string carpetaBundlesPrototipo = "Assets/Materialspace";
        Directory.CreateDirectory(carpetaBundlesPrototipo);

        AssetBundleBuild[] buildMap = new AssetBundleBuild[2];
        buildMap[0].assetBundleName = "materialspace";
        buildMap[0].assetNames = new[] {"Assets/modelos/materialspace.prefab","","" };

        //BuildPipeline.BuildAssetBundles(carpetaBundlesPrototipo, buildMap, BuildAssetBundleOptions.ChunkBasedCompression, EditorUserBuildSettings.activeBuildTarget);
        BuildPipeline.BuildAssetBundles(carpetaBundlesPrototipo, buildMap, BuildAssetBundleOptions.UncompressedAssetBundle, EditorUserBuildSettings.activeBuildTarget);
        Debug.Log("Building bundles for");

    }

But if i use the “BuildAssetBundleOptions.UncompressedAssetBundle” or “BuildAssetBundleOptions.ChunkBasedCompression”, My archive have a long size like a 16 mb , and the real size of my asset it’s of 500 kb , so some one have a solution o have the same problem resolve ?

Iwill be gratful

Hi , i has the same problem , some one have a solution ?
or another way to download the materials o textures , and images ?

thanks alot