When the kids were still sitting in their black Tripp Trapps at the table, 17 years ago, I had made some pillows for them to sit on with a very nice butterfly pattern. There was some material left over that I had started making a tote bag out of. Now is the moment to finish it!
The inner pocket has a zipper at the top and is three-dimensional at the bottom so the outside material doesn’t bulge out and get stressed.
Shall I reinforce the bottom of the bag too? Yes, she sometimes carries heavy things in it. This is not meant to be a super light bag so it might as well have extra features.
A waterproof umbrella baggy inside, lined with dyneema? That would be something … How to attach it? Just at the top? I have some umbrella covers somewhere …
Straps to hold a bottle upright? Too much?
A hidden pocket at the bottom? I love them but they’re not really used. One on each side of the bottom reinforcement? Make the whole reinforcement double, meeting in the middle without sewing it together…
As soon as you turn things inside out, the inside is smaller than the outside, because the thickness of the material is not zero. So sewing is mathematical in 2.5 dimensions. This version of the bottom reinforcement just doesn’t sit well.
There is no need to “finish” the seams by folding them over. It just adds bulk in the third dimension.
Cool and Interesting 
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