Be careful with baggage weight (there is 20 kg limit)-- on back way we've paid $ 60 for 6 kg overweight. (havebabywilltravel.com)
If all four are required, one item would be part of any pre-purchased hold baggage weight allowance on the same booking. (thomascookairlines.com)
FREE Ultimate Insider's Guide to Traveling Through Airports - Move through airports faster, cheaper and with less stress - Includes baggage weights and rates for every major airline! (amazon.com)