Mueller APV 4.5-14x40 AO https://www.amazon.com/dp/B000SULCTA/ref=cm_sw_r_other_apa_i_lZx3EbVQPMCWE

Also note it's not tiny. If your backpacker is for backpacking, I stand by buying a leupold fx2, even if it's a little pricey.