At eBay, this adidas Defender backpack comes to $21 with promo code “SHOPBRANDS20”, down from a $55 list price. The code takes 20% off the $26 listed price and is capped at $500, so a single backpack easily qualifies. It is sold directly by adidas, includes free shipping and 30-day returns, and the offer ends Nov 15. Buy Now at eBay