Review on 🎒 Gelindo Insulated Hydration Backpack Pack with 2.5L BPA Free Bladder - Stay Hydrated and Cool for up to 4 Hours - Ideal for Hiking, Camping, Cycling, and Running - 18L Water Backpack by Sfl Richardson

Surprisingly spacious for such a small footprint. It has enough space for a 2.5 liter tank, sweatshirt, magazines, light jacket/windbreaker, snacks, GPS device, phone and more. The best thing about this bag is the separate storage/compartments. Plenty of other 18L backpacks hold that too, but they're disappointing because you can't keep your personal devices off your hydration bladder, your food off your umbrella, and so on. This bag has enough compartments in different sizes.