pack Textures+Models or all Animetions in 1 file?

hi is it possible to pack Model+texture in 1 file and unity 3d is still able to read/open it? and also all animetions in 1 file want to know since im making a SSB engine(like as Mugen for 2d fighting games) with unity and will be nice if models+texture is packed into 1 file and same with all animetions for a character/item/stage also will be easier for me/others then i will make the character/Stage Editor for custom characters movesets/textures/alt. models(like doctor mario over mario´s bonetree) or custom stages