Whole eating from a plastic container that had 4 different pockets in it, I noticed that the liquid food tends to enter the grooves in the container. It got me thinking what is the purpose of these and why can’t there be containers that have a smooth interior?
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I think other commenters are on point with saying it’s structural.
My Tupperware has smooth, wavy grooves instead of rigid cornered grooves, which makes for easier cleaning. You might look for that as an alternative or glass Tupperware, which is strong enough to not need grooves at all and an overall better material for regular microwaving and cleaning.
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