So DH decided he wants to get a Damier Keepall (and spoil my plan of getting the Damier Eole 50). I know only the Damier Keepall 55 comes w/ a strap, but is it possible to SO a 45 or 50 w/ a strap? Right now & for the next 2 years, DH and I will be traveling extensively in Europe (smaller planes), so a 55 may be too big to carry on. I just thought I'd check here first before calling my LV boutique (in case the answer is a resounding "No"). Thanks!