Most backpacks come with a diamond-shaped patch on the top that never seems to get used for anything, so what’s its purpose?
As with most features, it does have one that comes in particularly handy if you have a thing for carabiners: attaching items you may need to get fast.
As Lifehacker explains:
Commonly called lash tabs or pig snouts, these patches are meant to hold stuff that might not fit in your bag or that you want easy access to, like a rolled up jacket or water bottle. You can even use it for larger items, like a pair of shoes or flashlight, when traveling or exploring outdoors. Simply attach whatever you want to carry to a thin rope and loop it through the patch’s slits.
Now you know!
Full story at Marie Claire via Lifehacker.
Built in hacks.