I didnt notice any markings for front and back, tho the parts list labels which is which (in microscopic font). It held 2 large very full extended suitcases, one medium full extended suitcase, two small full extended suitcases. Hell, a friend dropped a piece of food on my kitchen floor and picked it up and ate it the other day. I am a fan of Sennheiser and still going on. The zippers are very well sewn in and dont seem like they will rip or fail. Also really easy to retrieve one pan without having a move a bunch of others. I bought these for my wedding and they are going to be perfect with my dress. Im glad I didnt return them for a bigger size. Ive worn a Medium for years, but this Medium does not fit. It was comfortable, with good sole padding, a firmly gripping rubber sole, was easy to put on and they stayed on.