Reversible Bag

Spot the obvious mistake. My fabric cost £2.50 from my local remnants box but I missed something when cutting out, boyfriend thought it had a purpose so if you can think of one please let me know!

Thanks for the Pattern and Thank You All for the comments. I made mine a bit bigger just incase.

It's my second ever bag, first time making on my own and I DID find it a BIT DIFFICULT. I wouldn't rate this as easy for a beginner but I did enjoyed every minute, even turning inside out with such force that I took the skin off my knuckles, really blood sweat and tears went into this one!