As I noted in an earlier post, we had nine outside volunteers, including myself, participate in this trip. The five of us who came directly from the U.S. to Lesotho got to act as "mules," carrying laptops and other project supplies with us.
I think I still hold the L2L record for taking the heaviest load without paying any baggage fees, set last trip in late 2011 when I hauled 170 lbs (77 kg) of equipment and very few personal belongings from Idaho to Maseru. This year, I carried a mere 150 lbs (68 kg) because I had other volunteers helping to carry some pretty heavy loads as well.
Among my many tips to maximize the amount of equipment I can take for free: Fly on an airline that lets you take two 50 lb. bags free on international flights, maximize your carry-on with a "laptop" bag almost as big as a regular carry-on, wear a multi-pocket vest loaded down with 10 lbs of gear, carry rain gear and heavy clothing in your hand (I've been snowed on in Lesotho during their summer, so warm clothes are a must any time of year), and buy toiletries and undergarments once in-country. And be in good shape, because, even after you've checked those 100 lbs through to your destination, you still have 50-70 lbs of stuff to lug with you through multiple airports, on planes, and to ground transport.