The Canvas Camden Tote Bag

At Madewell
Made of supersturdy cotton canvas, this roomy colorblock tote has both schlep-friendly top handles and a removable crossbody strap. Big enough to hold all your go-to-the-park necessities (a towel, a picnic lunch, a frisbee), it has a secure zip pocket inside and slide compartments on the outside (the little leather one is made for a subway card or a pool ID).