The Mountain Hardware Fluid 12 is a great little pack that is deceptively svelte. While 'cavernous' probably isn't the right word to describe the main compartment of the pack, it does offer quite a bit of room for the necessities of a day hike (extra layer, sunblock, maps, snacks, etc.) & then some. There are also five smaller pockets on the outside (two mesh side pockets, one on the top of the pack, & two hip belt pockets) which give lots of options for extra storage. The top pocket has a very soft lining making it ideal for a phone or other electronics, & the side mesh pockets have enough stretch to fit a Nalgene. The pack sits very comfortably in the center of the back, & the hip belt & sternum strap keep it securely in place, & while it doesn't have a frame so to speak, there is a semi rigid back piece that keeps your back protected. Only knock I have is the cord lock on the bungee doesn't secure well & it's difficult to push in the button to loosen it if you do need to adjust.
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