the lunchbag is based on some written instructions in a magazine. sorry i don't remember where exactly. I have been using oil cloth ordered from sewmamasew for these. (they came on recommendation from sally, so i knew it would be good!)
i made a cardboard template that is a little ragged but still works. the bag is a very simple 6 pieces:
back / flap - about 61/2 by 14 inches
front - 6 1/2 by 8 1/2 inches
sides - 5 1/2 by 8 1/2 inches
bottom - 6 1/2 by 5 1/2 inches
it is stitched wrong sides together. starting with attaching the front and back pieces to the bottom piece; then the sides to the bottom; then joining these to the front and back, starting the stitching at the bottom.
i put a strip of velcro (hook) horizontal, about 2 inches from the top edge of the back piece, on the wrong side
i put two shorter strips (loop) vertically on the right side of the front piece (to attach to the piece on the back, which folds over to the front when the bag is "closed".
i also add a little pocket to one side, which you can kind of see here with the bag on the far left. i also add a strap at the top.
it is not insultated. though i have been investigating how this might be done. i also have some pieces cut in a canvas that i have been meaning to try. (i am all for machine washable lunchbags and haven't been brave enough to run the oilcloth ones through the machine.)
does this make sense? i hope so. please feel free to email me if it doesn't. i tend to cut the oil cloth with my rotary cutter and just piece it together as i go along, to make sure it will fit.
thanks for your interest.
and happy international women's day. to all the women in my life (that includes you!) thank you.