I advise you to buy. Before the start of the GUS, it was possible to use the bonus system. When buying 3 packs of 90 lenses, a package in color or 30 lenses came out for free. And if you participate in constant contests and tests, bonuses accumulate even faster. Some pros: Price. For 5 years of use, there has never been a marriage. Although many write that in each pack. Some cons: Low water content, and thick, but that's why the price is similar. The maximum comfortable wearing time, without hanging up in the computer, is 10 hours, then you already want to take it off.
LifeStraw Go Water Filter Bottle: The Ultimate 2-Stage Integrated Filter Straw for Hiking Adventures
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