Ozark springs see a lot of rain and varied temperatures; Ozark summers tend to be hot, muggy, and wet; Ozark winters can drop below freezing. Wet weather is common to the Ozark climate, especially in late spring through summer, and fosters a breeding ground for bugs, mosquitos, and ticks. Consider bringing waterproof shoes and treating your clothes ahead of time with permethrin to repel insects. In the colder seasons insulating layers are a must, and a good rain shell for you and rain fly for your tent are necessary year-round. Includes a place to connect your hydration bladder. This daypack came in handy just for what I intended. If you have a friend that enjoys hiking (or if you need a new backpack yourself!), check out these deals on Ozark Trail Hiking Backpacks today – you can grab these as low as $10. Of course it has no side water holsters, or lid pocket, or hipbelt strap, but I think that all contributes to its low weight. For water and OJ I use Vapur anti bottles which aren't bulky at all. My glucose meter and keys went in the small outside pocket. I did instantly notice the difference of carrying a lighter bag. For the water bottles I just use Platypus .5 liter and 1 liter flat style bottles, which you can fit in the main body of the pack on top of your other gear. Here's another AWESOME thing about the Ozark Trail Atka day pack. It's sized to fit every airline's carry-on size requirements.