Picnics always look so appealing in the movies, like that scene in O Brother, Where Art Thou? where John Goodman breaks off the tree branch and starts swinging. But here in the real world, picnics take a lot of work and schlepping, and if you don’t have one of those deluxe picnic baskets an unspoken feeling of inadequacy can quickly turn that potato salad to sawdust in your mouth. Thankfully, there are a number of......