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A number [6] of frames hold [39 gallon leaf-litter] bags. These frames are in turn held by table-like bases which can easily be stacked. I wouldn't trust the bags to hold anything very heavy, like glass or paper products, but for plastics, it'll be great.

Total wood use , excluding prototyping, was 14 eight-foot (3x1 nominal, I think) furring strips and about 50" of 2x4 - about 25$.
I also used about about 250 1.25" staples and maybe 6-8 oz of wood glue, though you could get away with somewhat less of both.

As far as tools go, you'll need a radial arm saw (or suitable substitute), some way to rip a few furring strips in half (a table saw or band saw with a fence would be ideal), and a brad or staple gun.

Total build time, excluding design, prototyping, and rework, was about 5 hours - about two hours of cutting and three hours of assembly.

I'm providing a [pro/ENGINEER 5] parametric sketch so that you can modify the design to make it in different sizes, or for slightly different uses, like lightweight tables. (at this time, I can't figure out how to attach files, so I'm hosting it here.)

Step 1: Cut Wood

You'll need to cut some wood. The following dimensions are predicated on the size of bag that I used, so if you are using a different bag size, you'll need to modify them.

For the frames:
  • 6*4 = 24 pieces of furring strip, length 17.25"
  • 6*4 = 24 pieces of 2x4 cut into 90º-45º-45º triangles -  the small way, where the legs of the 90º angle are 3.5" long
These are modified before use. See the next step.

For the bases:
  • 2*4 = 8 pieces of furring strip, length 37.75" (legs)
  • 2*2 = 4 pieces of furring strip, length 51.5" (long horizontal member)
  • 2*2 = 4 pieces of furring strip, length 18.25" (short horizontal member)
  • 2*4 = 8 pieces of half-furring strip, length 3.37" (short sections of frame-shelf inside corner bracing)
  • 2*4 = 8 pieces of half-furring strip, length 4.1" (longer sections of frame-shelf inside corner bracing)
  • 2*2 = 4 pieces of half-furring strip, length about 35" (long sections of frame-shelf along inside of long horizontal member)
  • 2*2*4 = 16 pieces of half-furring strip, length 12.9" (diagonal corner-braces)
  • 2*2 = 4 pieces of half-furring strip, length 18.25" (the leg-stays)
  • 2*4 = 8 pieces of 2x4 cut into 90º-45º-45º triangles -  the big way, where the legs of the 90º angle are 5" long
Three notes on the pieces for the base:
  1.  The diagonal corner-braces and sections of frame-shelf have their ends cut at 45º angles. The length is the total overall length.
  2. Regarding the little sections of frame-shelf: the shape is chiral, and you actually need 4 of each handedness in each size. That is, you need 4 left-handed 3.4" chunks, 4 right-handed 3.4" chunks, 4 left-handed 4.1" chunks, and 4 right-handed 4.1" chunks. I've included a picture demonstrating an easy way to produce these pieces.
  3. The above dimensions embody four refinements from the base I actually built:
  • Two lengths of short-frame-shelf, rather than one. (Woops.)
  • Length of leg-stays as 18.25" rather than 18.5". (forgot a factor in the tolerance stack-up)
  • Long length of the frame-shelf cut with 45º angles on each end, instead of being lazy like I was.
  • Trust my initial calculations, not the work-site recalcs, and make the long horizontal member 51.5", not 50".

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