Prep Naturals Food Container Gasket Spacer

I bought some 32-oz food prep containers by "Prep Naturals" (Amazon code B081JRZ8W6).
Unfortunately these have a design flaw in that the live-hinge/latch design isn't well-tuned, and as a result, the lids like to spring open by themselves.

I designed this gasket spacer to increase the mating force, resulting in a much more secure lock. If this feels too short (or too tall), scale the Z dimension +-10% or so.