This is another very simple but extremely useful system, especially when keeping all of your things in bags or a backpack. In my case, after lasik I still sometimes get very dry eyes in the morning. I have to fumble around in the dark, or in a bag, and somehow manage to find a bottle and pour whatever’s in it into my eye. It would generally be better for my happiness and the sleep of those around me if it wasn’t a bottle of shampoo or glue. The cool hack is to wrap the bottle in tape, and put a predetermined set of folds into the tape. You can easily grab bottles and, by feeling for the folds, know by count if it’s a bottle of shaving oil or the lifesaving drops.

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