This Holster AmazonBasics is for all 5 DS expounds: DS, DS Lite, DS i, DS i XL and the 3DS. It can be opened and closed by zipper, looks good and is externally fitted hard plastic - protection is thus really guaranteed. Good idea: there are extra pockets, can be placed in the 3 games. The unit itself is under 2 wide rubber bands (in total there are 4: 2 for the DS Lite and DS 3, and 2 for the DS i XL) pushed and sits as firmly.
Personally, I would however recommend this case only for the DS i XL. For the DS Lite and 3DS I find the envelope too large. While it is well-intentioned, to be covered with a sheath all devices, only it makes little sense, since they are simply different sizes - why would you want a DS Lite or storing a 3DS in too large a case?