UA Midi Backpack 2.0 Your gym buddy may already have a duffel bag, but chances are they don't have one of these yet. This UA Midi Backpack 2.0 ($30, originally $40) is the ideal catch-all if you're just going for a quick Spin class or a shorter workout session. Image Source: underarmour.com UA Midi Backpack 2.0 $30 from underarmour.com Buy Now