The ornamental design for a roll-up stretcher, as shown and described.
FIG. 1 is a plan view of a pattern for the base plate for a roll-up stretcher showing my new invention;
FIG. 2 is an elevation view of a head side thereof;
FIG. 3 is an elevation view of a foot side thereof;
FIG. 4 is a side view thereof, the two sides being mirror images of one another;
FIG. 5 is a bottom plan view thereof; and,
FIG. 6 is a perspective view of the roll-up stretcher having been formed into a stretcher trough, the shape of which is retained by the connection straps illustrated in dashed lines.
The dashed lines in the drawings form no part of the claimed invention.