Hi Huzefa:
Not answering your questions… but reading them and the other ones you posted, I am thinking that you are new to backpacking. If correct, then as you can imagine, there are lots and lots of gear to buy and choices to make.
I was a newbie myself just four years ago, so I can still remember the hundreds of hours spent evaluating gear pieces and making choices of "what might work best" — all the while with little real hiking experience!
Unfortunately for you, "try before you buy" is not an option since you are located in India. Rather than buying what others think are best — and end up with many pieces that might not work for you — or might not work well together as a system — I highly recommend that you start off with a good backpacking book — to get a systematic idea of all the gear pieces that you might need. For example, you will want to know what types of packs are out there — and whether a frameless pack is what you need — and if so, then what types of sleeping pads options are out there. You don't want to be buying a pack first, then selecting the pad to work as a frame — only to find out later that it is uncomfortable to sleep on! Or maybe the pad that's most comfy for you will work poorly as a "frame" — in which case, you might decide to buy a pack that comes with its own frame — and so on and so forth.
Once you've done your reading — then I would suggest making a spreadsheet — and listing out all the gear you'll need. You can then list out your top 1 or 2 or 3 choices for each item listed. When you do this, it's important to evaluate each gear piece individually — AND also how each piece will work with the rest as a system.
One book that I highly recommend is "The Ultralight Backpacker" – Ryel Kestenbaum.
Another one is "The Backpacker's Handbook" – Townsend – 3rd Edition.
Generally, I would recommend that you buy your backpack last — after you've finalized your decisions on sleeping bag, pad, tent, clothing, etc.
Hope this helps.
