you can always downscale it if you want(the textures are not embeded this time = you can batch downscale and replace the images on the folder, it should work fine, but 128X128 is really really small in my opinion, here's a comparaison =
the whole pack is roughly about 10mo for +125 items with 512X512 textures(I think it's small enough)
in 128X128, you loose too much quality in my opinion :)
/and note that it's not one item per texture, there's multiple objects that share the same textures
