Saturday Mac riddles 172

Here are this weekend’s riddles to entertain you through family time, shopping and recreation.

1: Practicality of storage in your back for first aid.

2: Service repository hidden for compression.

3: Useful thing for unseen narration and accessibility.

To help you cross-check your solutions, there’s a common factor between them.

I’ll post my solutions first thing on Monday morning.

Please don’t post your solutions as comments here: it spoils it for others.