Mystery Make

Let me know when you guess what this bag is for:

1 I cut a piece about 5 inches by 60 from my random sized piece of fabric.  I cut the rest into four pieces about 12 x 16", then cut about 3.5 x 1.5 off two corners on each to create 'shoulders'. (significant detail) 

I stitched two of the four pieces together (rst) around the sides and the bottom, leaving a 4 inch opening in one side.

I stitched the other two pieces together but with a piece of plastic in between at the bottom half (the sort of plastic that clear shower curtains are sometimes made of) (another significant detail) 

2 I stitched the really long piece into a bag strap
(fold length ways, fold edges into fold, fold in half, top stitch - if you want to know in more detail or anything else I'm vague about, just ask in the comments section)

3 I then repeated the first two and forth stages with two of the bits that were taken off to create the shoulders

4 I used the triangles gusset method to give the bag a flat bottom

5 I turned one bag the right way round and put it inside the other

6 I pinned the two together with the straps and the short almost straps in between the two layers

Here is a bit of strap peeping out

7 I then stitched all round the top of the two bags joining them together, and snipped the acute corners, and trimmed the obtuse corners (I think that's what they are called)

8 I then turned the whole thing through the gap, and top stitched along the top edge.

9 Then I added Velcro to either side of the very top of the bag (another significant detail)

Any idea yet?

10 I then filled it with my 'bag for life' shopping bags,

and next I'll clip my trolley coin thingy to the D ring, and put my shopping list in the clear pocket, and Velcro the whole thing to the shopping trolley with my keys and my purse safely inside