For my medium Venetas, I'm now using a Purse To Go, in the "large" size (the current available sizes are "small," "large," and "jumbo").
I am using it with the pockets towards the center. I folded the top edge to decrease its height, so it does not interfere with the slouching of the zipper edge of the Veneta. I could probably leave it unfolded, though, if I wanted to preserve more of the flat shape when carrying it. It would protect more height on the sides of the lining that way.
I've been using it for a few months. So far, I like this better than the medium Chameleon for my medium Venetas. The Chameleon is like a small box shape, so some interior space was wasted, and it had to be squashed width-wise inside the flattish Veneta. The PTG is like a narrow oval shape, and almost no room is wasted.
Blueiris,
I have the PTG in 3 sizes, and I do find it fits better in the Veneta since the shape is similar (oval vs square Chameleon). I have also used PTG in my Cervo Hobo, although I do not like that the outline of the insert is so visible on the outside of the Hobo, kwim? Darn deerskin is so soft!
Since I change so often and sometimes in a rush, I have been known to put my Chameleon inside the PTG .
Thanks for you input!