Buy a box of Tic Tacs and share them out! When they're all gone you can remove the stickers or leave them on.
Take your bobby pins...
...and place inside your empty Tic Tac box. You can leave it at this point if you like, but if you do, tape around where the lid and box meet, as the lid will fall off otherwise.
I painted mine with nail varnish, making sure to paint over where the lid and box meet to keep it closed!
The other side of the box.
Now you can easily keep track of those pesky hair pins. Mine always ended up in the vacuum cleaner before!
Now you can put your box in your bag and never be stuck for hair pins when you're out and about!