TomTop offers the Swissgear 15.6" Laptop Charging Backpack for $39.99. Coupon code "SWBP10" cuts it to $29.99. With free shipping, that's $33 off and the lowest price we could find. It includes a USB charging cable and features waterproof fabric.
Note: This item ships from China and may three to four weeks to arrive. The countdown timer on the product page does not reflect an actual expiration time and resets daily.
Knowing what to expect in advance can help you prepare for -- and adjust to -- life in your golden years.