You want a backpack that is big enough to hold just a bit more than the stuff you are bringing and not more than that. If a backpack fits everything you want, has a bit of extra room, and feels comfortable, then you have found the perfect backpack size. Manufacturers also have suggested torso and waist sizes for each model they produce, but Ive found that the best way to know if a backpack feels right is to simply try it on.
When you are at the store (and any good camping/outdoors store will do this), they should be able to stuff your backpack with the equivalent of 30 pounds (15 kilograms) so you can see how that much weight feels on your back.
If your pack doesnt have two zippers, you can always get Pacsafe (www.pacsafe.com), which wraps a lockable metal mesh around your whole bag and can be tied to a large object. It means that not only is no one breaking into your stuff, no one is walking away with it either. Pacsafe is a good form of protection for your bag, especially if you are going to be somewhere where your bag will be unattended for a long time. One thing to remember about Pacsafe is that this metal mesh also adds a lot of weight to your bag and it can be burdensome to carry around. Most people I know who use Pacsafe are photographers who carry a lot of expensive equipment around. Extra info : Buy tents on SportyOuta!
Hiking gear : In terms of the t-shirts and long-sleeve hiking shirts you should go for a lightweight breathable fabric like merino wool or polyester.
As you will be sweating a lot each day, you want a shirt that dries quickly and performs well in moist / wet environments.
You do not want to trek in cotton as it is hydrophilic and inhibits moisture transfer. Nylon is okay but does not breathe as well as merino or polyester.
Backpacking Essentials : Dont Buy All Your Backpacking Equipment at Once
Start out with a few basics and take a 1-night backpacking trip, during a warm time of year, with no rain in the forecast, to a location you already know.
On your first trip take note of items that you may or may not need in your pack.
After returning home you can reduce or buy more backpacking gear if / as required.
It will take some time to find out what you actually need or what fits you the best.
Hiking shoes : These range from mid- to high-cut models and are intended for day hikes or short backpacking trips with light loads. They often flex easily and require little break-in time, but they lack the support and durability of stout backpacking boots. Materials impact a boots weight, breathability, durability and water resistance. Waterproof membranes: Boots and shoes billed as waterproof feature uppers constructed with waterproof/breathable membranes (such as Gore-Tex or eVent) to keep feet dry in wet conditions. Downside: The reduced breathability created by a membrane (compared to the ventilating mesh used on some nonwaterproof shoes) may encourage feet to sweat on summer days.
https://sportyouta.com/ is a sports, outdoors and trekking equipment online store.