What's the point of having the option "leave it" for backpacks? If you click on a backpack it should search it, without asking for further confirmation
@Selva, the cost of buildings depends on how many you have. Now I have 6 huts and the next one costs 1220 wood, and 4 log houses and the next one costs 350 wood and 437 minerals: at that price, it's faster to build another 2 logs than 1 hut.
you can press the A at the bottom next to the mute buttons :)