i'm about 5'10'' and i pack with the larger GV soft pack (sailor soft pack) and the bulge it creates is nowhere near huge, can't even tell in anything but skinny jeans. a five inch packer doesn't equal a 5 inch real penis! especially with the mr. limpy, the small mr. limpy has tiny flat balls, while the balls of the XS mr. limpy are almost round, which makes both packers look pretty much the same size in your pants (3.5 inches of dick resting on a decent sized sack or 5 inch dick with an half inch disk of "balls"). with the 3.5 inch one there can be erection issues, the five inch one will always lie flat because it's much limper.
But maybe you could talk your mom into getting you the goodvibes sailor soft pack instead? it's much more durable, and more realistic in color and feel. plus, it's phtalate-free.
@ Arch: there's a 4 inch and a 5 inch gv soft pack. if you don't like the silicone rod through the shaft you can remove it :