Heading to Europe in a month for 3 weeks. Hitting Paris, London, and the Canary Islands/Tenerife. The wife will have our daughter in a front facing Ergobaby sling, along with a frame camping backpack. I need to take my 15" MBP, charger, Magic Mouse, along with 2 pairs of jeans, 3 t-shirts, a bathing suit, and socks/underwear with me. Would prefer to take all of this in one bag if I could. Really looking for something leather, waterproof, with a crossbody strap that could be detachable. Hopefully staying under $150.