Approximately 590 cubic inches (1/3 of a cubic foot). Fills a USPS Medium Flat Rate Box. They have been in storage for many years. They have not been sorted. Nor have I attempted to clean them, though they do not appear dirty. There might be a few non-LEGO pieces in the lot, either compatible building blocks or some random other small items. Sold as-is.
Payment must be received within two days of the close of auction. I will ship the morning following receipt of payment.