I got into this system for the size (small). The system has grown to 2 bodies EM5, EM1, 12-40, 25, 12, 75, 9-18, 40-150 and 12-50, FL600R and a Benro tripod. Am going away for 3 weeks to the USA (Vegas, niagara, NY). Trying to get all of the above except 12-50 and maybe the 12 along with headphones and ipad in a cover is proving to be a nightmare. Have trawled thru all bag posts here and the Billingham hadley pro seems to be closest to what I need but is not available in Oz. Of all the bags I own i can fit all the above into the UD 50 (sans tripod). Becomes quite big!!! Will be taking along a Lowepro apex 140 to break kit up and travel locally. Nice thing about the UD is I can carry it as a shoulder bag or a back-pack or hoist it on a trolley bag. Have a week more to decide. Maybe I am overdoing it a bit. Maybe i should cut back on what I carry..... Any suggestions???