Gym bags are a staple. I lose my keys all over the place at the gym. Even left my phone there a few times.
I wanted a gym bag that will also suit me when I take the kids to the beach, their sports or road trips to act as a snack bag.
Multi purpose is key.
Use the two straps as a handle or over your shoulders or even your elbow. Even utilise the longer strap. Roomy with a pocket inside for your keys and phone.