I feel the tiniest bit like Houdini - I came up with a way to make the fabric box with no hand stitching and no seam binding...
Here we go
This is improved version 2.0 of the fabric box I tried to make in my other recent instructable: https://www.instructables.com/id/fabric-covered-storage-box-with-custom-dimensions/. Forget that one and use this one instead. I think its much easier.
Step 1: Materials
seam ripper (aka the "undo button")
remnants of a suitable size to cover the inside and outside surfaces of the box.
enough cardboard or soft sheet plastic for 4 walls and the bottom
scissor sharpener (recommended)
Step 2: Determine Dimensions
it will be as tall as the box is tall plus half again the shortest of the width or depth (whichever is smaller).
You'll cut another piece to be the interior that will be as tall as the box will be by enough to go around all four walls, no bottom.
The bottom will be made separately and inserted into the box last.
Step 3: Cut the Fabric to the Dimensions
Be careful to keep the cutting lines straight and the corners as square as you can.
Step 4: Cut the Cardboard Pieces
Step 5: Mark the Sides
Step 6: Stitch the Exterior to the Interior Along the Top
Step 7: Press and Top Stitch the Top Seam
top stitch along the top seam
Step 8: One Giant Tube
Step 9: Sew the Wall Guides
Fold the tube in half so the top seam is the top again.
Using the chalk marks you made in step 5, pin along the chalk lines so that the pins capture two layers of fabric the exterior and the lining (not all four layers). Sew the corners of the walls along the chalk marks. These seams will form the guides into which you will slide the cardboard walls.
Step 10: Sanity Check
Step 11: Sew Bottom Seam
Step 12: Mark the Side Bottom Seams
Insert the four cardboard walls into the guides.
This is the tricky part, because with the bottom seam sewn, you have less room to maneuver the walls in there. The first two walls should go in easily enough, but the second two will probably need to be folded first before you can slide them in. Then once they are in place, you can unfold them in their place so they are fully flat and in their final position. It's tricky and takes a little bit of wrestling, but to me this is way better than having to sew the tops of the walls closed like in my first attempt: https://www.instructables.com/id/fabric-covered-storage-box-with-custom-dimensions/
Lay it bottom side down and stretch out the bottom to full size by sliding the bottom cardboard piece into the bottom of the box. This will create two triangles of extra fabric on either side of the box.
Line up the bottom seam so that it is straight and then press the triangles flat and pin them. Mark along where they form the bottom edge of the box with chalk or some other marking utensil.
Step 13: Sew Bottom Side Seams
Cut away the excess fabric triangle.
Serge the edge of the seam you just made to reinforce it.
Step 14: Cover Bottom
Step 15: Final Assembly
Then slide the bottom in so it fits snugly and helps support the overall structure of the box.