hi guys need some help here in the early part of 96 i bought a lowe alpine travel convertable back pack ( can be used as suitcase or backpack the flap that covers backpack straps when used as suitcase rolls up underneath you when as backpack. thing is not sure if i still have any paperwork that may have come with it and cant see a size thing on it. want to get a pacsafe wire mesh thing but need to work out the size. lowe alpine co does not have a email address or contact us section any suggestions in how to work out how many litres backpack is?