There are 2 books in the Sihpromatum series. The newest book is Backpacks and Bra Straps which came out in 2014.

1
I Grew my Boobs in China

Book cover of I Grew my Boobs in China
Sihpromatum (Sip-row-may-tum) is a memoir series of one family’s incredible four-year, 80 country backpacking adventure. The first installment, I Grew My Boobs in China, takes the reader through China and Mongolia. In 2005, 14-year-old Savannah Grace's perfect world is shattered when her mother unexpectedly announces that she, her mother (45),…
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2
Backpacks and Bra Straps

Book cover of Backpacks and Bra Straps
Savannah Grace’s best selling, award winning saga of her family’s four-year-long backpacking adventure continues. "Backpacks and Bra Straps" picks up where "I Grew My Boobs in China" leaves off, offering insights into how family dynamics are affected by such intensive togetherness as well as a candid, intriguing look at world-wide…