Strap ripped after minimal use

My daughter's school prefers for kids to use tote bags instead of backpacks for kindergarten and this bag seemed like a perfect choice. I was satisfied with the quality when I received it, but after only a week and a half of light use, one of the straps ripped off. The bag only held my daughter's lunch bag and a small water bottle, so nothing heavy and she's not the sort of kid who'd be throwing this around. My reusable shopping bags from grocery stores have held up much better than this bag.