This backpack has an external USB port and fits a 15-inch MacBook Pro: $19 at Amazon (50% off)

$19

Uoobag Direct (99% lifetime positive feedback) via Amazon is offering its 15.6-inch Laptop Backpack for $19.22 shipped when coupon code J6L8JJ8H has been applied during checkout. That’s 50% off its typical rate and the lowest we’ve tracked. This backpack features an external USB port for charging your devices while on-the-go. Simply attach a battery pack inside and you’ll be able to easily plug in. Rated 4.6/5 stars.

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Go with Lenovo Laptop Carrying Case for $12 if you’d prefer a more professional look. Like the backpack above, this best-seller can hold a 15.6-inch laptop with room for some additional accessories.

15.6-inch Laptop Backpack features:

• There are multiple storage compartments including one iPad bin and one separate laptop compartment with cassette + glasses suspension design. Perfect for men, women or students’ daily use at work or school.
• Slim square outlook matches business-casual use perfectly.