Hey Couture_Girl:
I would recommend the Keepall 50 with a strap because from what I've heard, it can be a real pain to haul around a keepall without a strap. The 50 seems like a nice comfortable size and suitable for a short trip. It's really classy too! If you don't love the Mini Pleaty, don't keep it. Maybe you should try it on one last time before returning it, just to be sure....