This UA Halftime Backpack drops from $45 to $22.50 in multiple colors with code BACKPACK at checkout at UnderArmour.com. It also ships free when you log into your UA account, otherwise it adds $4.99. Note that you have to have already had a UA account in order to get free shipping.. Other stores charge over $30. This backpack features abrasion-resistant material and is water-resistant. There are three styles of backpacks that this code applies to.