Under Armour has Under Armour Undeniable Sackpack (Black/White) on sale for $12.50. Shipping is free w/ or promo code SLICKFS or ShopRunner (free trial).
Thanks to Deal Hunter rsvpd for finding this deal.
Notes: Extra 20% off for First Responders, Military and Educators: on the checkout page - on right side under Order Summary, click the Green Verify with ID.me button. More info, click here. Do not use SLICKFS; use ShopRunner for Free Shipping