adidas Amplifier 28L Backpack $40 at Amazon $40 $58 Amazon has the adidas Amplifier 28L Backpack (3 color options) on sale for $40 with free shipping. Interior sleeve securely stores up to a 16 inch laptop. Two side water bottle pockets that fit up to 32 oz bottles. $40 retail: $58 Posted by Faraday05/08/2026 at 05:42 PM PT