The two best-selling Backpacks currently are the Best Selling Baby Carrier Classic Backpack Carrier Baby Sling intl, Baby Carrier Backpack Wraps Front Backpack Multifuctional BabyCarrier Sling (Black) and Gray Star Ergobaby Baby Carrier Backpack Sling Multifunctional Baby carrier Sling Wrap Front Backpack BD01 intl. The most popular Backpacks are from DreamKart, Vakind and Ergobaby. Backpacks from these brands usually cost about S$ 8.00 to S$ 126.00. Depending on your needs, you can get Backpacks and Slings. Most Backpacks used today are in Yellow, Red and Purple. Up to 75% discounts on Backpacks can be found only on iprice.