Why are the sides of plastic storage containers sloped?

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Most large plastic storage containers like those produced by sterilite have sloped sides so that the top is wider than the base. This of course means that when placed side by side there is a large gap between them of wasted space. Is there a reason for this? Easier to manufacture? Structural integrity?

Edit: Thank you very much to all of you for your responses!

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Anonymous 0 Comments

Because you have to get them out of the mold. Pretty much all molded plastic parts have this draft angle, though it’s often well hidden so it’s not obvious just how the mold comes apart.

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