I choose the most useful equipment: memory card, mobile phone. laptop computer, digital camera, and MP3 player.
Memory card: it's possible to save any kind of information, memories as pictures and videos, projects, etc.
Mobile phone: almost everything can be done using one.
Laptop computer: for my work and many others is needed.
Digital camera: it changed the way of travelling and how to record the memories.
MP3 player: it helped to listen to music outdoor with a very lightweight device.