If it was me, I would buy a 320 gram one in there and see how it does. I'd imagine that will be plenty but if its struggling to maintain I would buy a second one. That will be PLENTY I would think.
Also I would guess Tupper Ware that large probably doesn't seal all that well.. I think they are more like blanket storage than air tight storage. I'd recommend a cooler instead. But that's unsolicited advice based on me having no idea what you have
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