No good recs for the above, but for my own summer use I like interesting textile prints and materials. Soft, slouchy, relaxed fabric, canvas, straw, thin suedes or woven patterns, etc. Etro, BV, Marni (hello DesignerValet!) and Missoni do really wonderful Spring/Summer bags that are great for the beach, for travel, or for the Mediterranean. The older Vukmirovic-designed Trussardi 1911 are also fun.