Kept mine in a 3500 size Plano this year, box is now warped, but it's more convenient than having them in bags for me. 

Here is my current Zman Ned box. It is the 3500 size double Plano. 

 

Just want to say I have over 2 years of experience with those smaller Plano double side boxes. Used the "small size" for 2 years with my TRD finess and on the other side I stacked texas jigs (sinking plastic). Nothing happened, nothing. (see the first 2 picture of that smaller box with scrapers. It has been in a backpack with weather from +30 to -30c (Im swedish) over 1000 times, still good.) Using 3700 for stacking/bulk at home, always those double sides (hard duty!) when fishing around city inshore Stockholm. Last picture are from my new replacement with that 3500 size, love it! Dont get scared of wasting those plastic bags, just remember not to mix em.

Just now, Fjalen said:

Just want to say I have over 2 years of experience with those smaller Plano double side boxes. Used the "small size" for 2 years with my TRD finess and on the other side I stacked texas jigs (sinking plastic). Nothing happened, nothing. (see the first 2 picture of that smaller box with scrapers. It has been in a backpack with weather from +30 to -30c (Im swedish) over 1000 times, still good.) Using 3700 for stacking/bulk at home, always those double sides (hard duty!) when fishing around city inshore Stockholm. Last picture are from my new replacement with that 3500 size, love it! Dont get scared of wasting those plastic bags, just remember not to mix em.

Can't edit, the new one is the "medium size" double side plano. Good luck

These are the Plano Edges filled with Z man.

 

Been using these a year with no issues.

 

@RRocket you are using the customizable box. I keep a little bit of plastic in Plano boxes. Be careful with the standard boxes (the thin grey permanent walls). 1 TRD warped both walls of the compartment it was in. I couldn't believe it.