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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14 Answers

Anonymous 0 Comments

Same reason gold ingots or chocolate bars gave sloped sides. If you let gold, or chocolate or plastic solidify inside a mold, the item will be much easier to get out if the walls of the mold look like

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as opposed to

|__|

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