We don't want to carry our huge tourist backpack to the top, but we damn we don't want to be left without water, snacks and extra things when we're there. If you want to take extra storage space with you on your next long hike , get a durable one but the compact 19L Mystery Ranch In & Out Backpack. This tech backpack has plenty of storage space essential for short missions and day trips as well as the ability to pack it in a large bag, guaranteeing that you will always be ready for any adventure.