I’m in the process of putting together a get-home bag for my daughter and came across this item on sale at Amazon. I checked the 3 month pricing and it normally sells for $19.99. I am picking one up.
In addition to the price, I like it because it filters down to a level that removes bacteria, protozoa, and viruses. It also filters out other contaminants such as heavy metals.
The only major drawback is that it is slow in filtering. However, given that it highly filters the water it is a trade-off.