Quick Demo How I sketch a backpack using tracing paper and Prismacolor premier Pencils. . Total time: 12 min. . . #idsketching #idsketch #productdesign #designsketching #designdrawing #productsketch #conceptsketch #idsketches #sketchaday #industrialdesign #markers #pencil #analog #quicksketch #instasketching #pencils #tracingpaper