The plastic seems a bit thinner than I expected but appears to be higher quality ABS. The clasps seem a little cheaper, be very careful with the clasps when the lid is off when all the closed clasps are flush with the box so there is no risk of them snagging on objects and breaking when moving or stacking. The heaviest boxed box weighs about 40 pounds. No bending/warping issues, a bit pricey for what you get but made in the USA which adds to the cost.
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