Takes a bit of thought but quite easy if you’ve done some machine sewing before BUT remember only sew one square gusset on the liner so can turn it inside out through the unsewn gusset (corner) then hand stitch the second one inside.
(herb garden idea) Got Pallets? Don't feel like turning up a bunch of grass? Use a pallet as a garden bed - staple garden cloth on the backside of the pallet fill with dirt and start growing! Courtesy of: Backyard Diva