The ornamental design for a bag, as shown and described.
1. Bag
1.1 : Perspective
1.2 : Front
1.3 : Back
1.4 : Right
1.5 : Left
1.6 : Top
1.7 : Bottom
1.8 : Partial, detail perspective view
The bag comprises a body and a shoulder strap; the body forms two adjacent vertical pockets, open to the top; one of the said pockets has a smaller width than the other pocket, and a vertical side which is horizontally offset in relation to the corresponding vertical side of the other pocket; the sequence of figures shows the bag in perspective view, front view, rear view, right-hand view, left-hand view, top view, bottom view, and a partial, detail perspective view; the dash-dot line in reproduction 1.8 depicts bounds of the partial view only and forms no part of the claimed design.