Sack
Bag
The kanji and the word are exactly the same. That means they share meanings as well.
ふくろ
The reading is the same as the one you learned with the kanji. So, put that knowledge in a sack and move on to the next item.
子どもが学校で使う用の袋を縫いました。
I sewed a bag for my kid to use at school.