Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: Why 75 bucks wont any clear PBA free bottle or bag like a platypus work the same?
Document: If considering buying this product, first review the information about the essentially-free SODIS "product", as implemented in developing countries without potable water ([...]). It uses a standard 2-liter empty soda bottle.The Puralytics product may have advantages because it is flatter than a standard 2-liter soda bottle, so should expose the water to more purifying UV. But ...
In a temporary emergency situation -- storm, earthquake, etc. -- tap water may be suspect or even unavailable. Water can be boiled, of course, but this item provides a supplementary water purification process, at least in summer. Good for campers, too. Water is your first requirement, before food and all the neat equipment. This has no moving parts, needs no batteries, and will work as long as there's lots of sun.
My brother and I have been using the Puralytics SolarBag water purifier on our backcountry trips for a while now, and it's a great product to have along, especially if you are doing day treks from a central camp - fill it up, find a sunny spot and let the SolarBag work its magic. Come back every afternoon to clean water. It packs up really easily, and it's light and no trouble at all to carry.I can imagine it's great for emergency situations, too, as others have mentioned.
Clean water not at all being a common thing in West Africa, I first bought 1 solarbag as a try-out.We just love it! It's easy to use - especially in countries like Mali with lots of sun - and drinking water has become a pleasure.We have now ordered 5 additional ones. A start towards adding them to all Papillon Reizen's travel kits.Highly recommend this product as well as Puralytics for the great way they serve their customers!
The SolarBag is a filter that requires no maintenance, can carry and clean 3 liters, and kills or removes every single harmful containment, including pesticides. It is reusable a couple hundred times (over 1000 liters). I use my SolarBag on week-long central Oregon motorcycle camping trips. It is great to be able to fill the bag up in a beautiful lake, stream or creek, let it sit in the sun for a couple hours, then drink tasty clean water.
Went on a camping trip,an tried it first day with stream water in colorado mountains .After letting set in full sun for about 5 hours had a cup ....tasted clean an fresh.
We camp multiple times each season and prefer sites off the grid. Some have running water that is treated onsite, some are wells, some are open water sources. This year we used the SolarBag for our water purifier, and the water taste was significantly improved, was very simple to use, and we just put it out while we were doing something else.
The Best Investment that i made ever towards my health and i recouped this money in about 3 hiking trips. I Strongly recommend Solarbag. I also use this at home. I bought two of them and use it at home for drinking water treatment. I live in Seattle, WA and it really treats water even in cloudy days. Thanks to inventors.. now i stopped buying water bottles from Costco saving around $60/month. It's an ultimate buy. Go Solarbag!! !.
Our team of five travelled to Malawi in 2012 with SolarBags. We filled them with water along our journey and never once had a problem. Not relying on bottled water is huge! While we were out meeting with people, the water was being purified in our SolarBag. I would TOTALLY recommend this product and I am confident it will give me clean/safe water no matter the water source.
It makes good sense to have a portable source of water purification. Also, it does not require any power other than light
Answer: no