T-KimsWomen Handbags Hobo Bag Tote Bags Shoulder Bag Soft Washed Leather Multifunctional Messenger Bag

Is this bag waterproof?

I love the bag but noticed the zipper is not on the side to open zip ,

Is it convienient to take 1 shoulder strap off to get into the backpack while using as a backpack, and still stay in place on back?

How big is the pocket at the back and can you fit a phone or purse in it