This is a set of a lunch bag and a cup bag, with a denim and broadcloth combination. The denim bottom is sturdy, so I think your lunch box will be stable. Thank you for viewing. Each item is carefully finished, but because it is handmade, there may be slight misalignments or distortions. We appreciate your understanding and purchase. ⭐︎Cup bag 　Outer fabric: Denim, broadcloth 　Lining: Cotton polyester, which dries easily and is wrinkle-resistant Height 21cm Width 16cm Depth 7cm ⭐︎Lunch bag 　Outer fabric: Denim, broadcloth 　Lining: Cotton polyester, which dries easily and is wrinkle-resistant 　Height 19cm Width 26cm Depth 10cm (Both are flat measurements) 　　(Please allow for some error) I hope you like it♪ I have other items for sale as well. Please take a look at my profile if you'd like. Thank you.