I've read lots of posts about people not buying the Gobi side cases because the claimed 37 liter capacity is far less. That said, people using them seem to love them and don't bitch about the size. I only found one post where someone measured the interior dimensions, he reported 16" long, 8.5" wide, 12" deep. That translates to 7 gal. or 26.5 liters. Can someone confirm or dispute this? I really want to like these bags but don't think 27 liters each will cut it.