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@Tijmen
I'm using 4mm Evazote wherever I use stiffening panels, my first instict was a sheet of HDPE for stiffness with a sheet of foam against rattling in the bottom and a ~15cm high strip of foam around the sides. But I tend to overdo stiffeners (Hello my name is Tijmen and I'm a recovering addict) so on second thought I'd lose the HDPE sheet and just go for a 15cm high open box of foam.
In my experience 4mm is more than enough, the main reason I put in stiffeners is for the bag to keep shape when empty, keeping shape when full is more a case of good packing and not something you'd want to force with inserts.