tiāo / le / bàn / tiān / zuì / hòu / xuǎn / le / yī / gè / bù / dà / bù / xiǎo / de / bēi / bāo

挑了半天，最后选了一个不大不小的背包。

After searching for a while, I finally picked a backpack that was neither too big nor too small.