Figure C.8 shows the growth in the number of parcels sent domestically and internationally by postal services since 2000 with the latter growing nearly threefold over the period. For instance, 84 per cent of cross-border goods purchased online weighed 2kg or less, and almost 60 per cent of them cost less than EUR 50 in 2017 (IPC, 2018), while 46 per cent of respondents to the 2017 IPC Cross-Border E-commerce Shopper Survey stated that received parcels have been small enough to fit into their mailbox. The overwhelming quantity of e-commerce parcels is a big challenge for customs authorities. Their clearance systems are designed to tackle large container shipments, not small parcels.