Hello,
I did some web research for you.
The Masho you have is;
• Length from base to tip 4.0 inches
• Length from ball to tip 2.75 inches
• Shaft width 1.25 inches
The Sailor has two sizes;
Sailor 1 (small) is 4" long by 1-3/8" in diameter (weight: 5.3 oz.)
Sailor 2 (large) is 5" long by 1 3/8" in diameter (weight: 5.8 oz.)
The Pack-it light is;
Pack it - lite: total length: 4.8", usable length: 4", width: 1.3", circumference: 4.08"
So both the Sailor and the Pack-it light are longer than the Masho, and wider in girth.
I also read that you are looking for bigger balls. As far as that goes... the Sailor and Pack-it light are both flat back. I don't think that is comparable to the Masho that has 3d balls.
I would not recommend using a harness with the Sailor as it can easily rip around the shaft/ball area. Although I also read people have fixed the tears with some Shoe-goo. The pack-it light is better for harness use.
I don't know if details are important to you, but the Pack-it has more detailing overal than the Sailor.