Lionel,
The dimension you hear are the OUTSIDE dimensions. So 20 or 40ft long and 8ft wide. The corner pockets are (going from memory here) about 8"x8".
Quote:
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External Measurements: 19ft 10in long; 8ft wide; 8ft 6in high [6.05m long; 2.44m wide; 2.59m high]
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https://www.discovercontainers.com/s...er-dimensions/
Hope that helps.
Matt