Originally Posted by Sotys
The question is about liners' - do they help to carry more things ? The important thing here is whether they really fit exactly to the cases ? I presume that if they fit well, this will even improve the baggage volume that can be put inside. This is essential as for the ling trips baggage issue is always on.
So, do they increase or decrease the baggage volume ?
That is a great question.
I have the BMW liners. The side case liners are an amazingly perfect fit for the side cases. In fact, if you overpack a liner with the slightest bulge, the side case lids won't close.
One issue with the BMW side case liner design is that the zipper runs along the middle of the top. To get at your stuff while you are out on a ride, you must take the liner out, or at least tip the liner far enough out of the side case to get at the zipper. The middle zipper means that most pack everything through the top - it isn't designed to be packed while it lays on its side.
There are non-BMW side case liners with two zippers - one on each edge of the liner. Those liners are easier to pack, because you can unzip the entire side flap of the liner with the liner laying on its side. It is also much easier to get at your stuff while you are out on a ride - the edge zipper is convenient to access, and you can unzip it to expose the top edge to get at snacks or drinks or whatever.
I also have the BMW 49 liter top case liner. It is a very good fit, but there is a little room at the top and along the sides. The empty space works out well to access small unpacked items such a jacket liner or a snack or a clipboard on top and spare gloves on the side edge for changing as you ride. The zipper runs along the top edge (more or less) and is very convenient for access.
The BMW liners are made of a heavy material, so you might be able to pack a tiny bit more if you buy a cheap liner made of thinner material. The bottom of the BMW liner is made of thick rubber. it is strong and durable. With the rubber bottom and the heavy cordura material, the BMW liners are quite stiff and stand up on their own.
Hopefully some of the others will chime in about their non-BMW liners.