So let's say your recipe calls for .75oz of a certain type of hops... so you buy a 1oz bag of it. What do you do with the .25oz? Do you just throw it into your brew and use the entire 1oz instead of .75oz? Do you store the .25oz?
If I have a situation where I have parts of a bag left I just tightly wrap the bag in plastic wrap and put it in a zip lock bag and put it in the freezer. This works just fine for short term storage, squeeze all air from the zip lock freezer bag. Try and use the fractional hop bags in a couple weeks.
Granted that, I write my own recipes so I try to just use full ounce packages and manipulate the recipe to fit the numbers so I don't end up with partial bags.
Investing in a vacuum sealer is a good plan in general though. I'm picking up one this coming weekend so I can start purchasing more bulk hops.
If you want to increase the weight and decrease the time, you can certainly do so. Although that may increase flavor and aroma, which may or may not be what you want.
I certainly see your drive to keep things in whole numbers, and as already said a number of us try to design our recipes as such. When I was was interviewing for a brewing job (that after being hired ended up not panning out for reasons I won't go into), head brewer asked me to rework a recipe's hopping (presumably because the hops in the original recipe weren't panning out in contracts, and in addition to wanting to make sure I knew what I was doing, was looking for an alternate opinion anyway), and later on (after being hired) asked me why I chose a slightly lower alpha bittering hop at a higher weight (Bravo vs. Apollo), and it was because I wanted to keep numbers to the whole pound, knowing that lots of pro brewers, like homebrewers, prefer to keep numbers rounded, except instead of 1oz hop increments and major-fraction (half pound, quarter pound, whole pound, at least by the ounce, etc) grain increments, it's by the lb for hops and by the sack for grains (Jamil said as much on one of the old CYBI episodes, don't ask me which because there's no way I'd remember). Head brewer boss figured that was the reasoning and respected it, even if he would have saved the extra money per batch by using a slightly higher hop (and having extra cost and complication to properly store the unused portion). So it's definitely a concern for a lot of folks, pros included.
You could always get an airtight container and throw all your leftovers in there and after say 6 months, make yourself a "kitchen sink" beer.
I take them to work, and use them as an air freshener/potpourri until they start to stink.
I donate my extra hops to the Salvation Army.
Nah, I save em and use them 'soon' or as soon as possible, throw em away if they get to much age on em.
I store them in the freezer and then a couple of years later I throw them out.
About once a year or so, I make a leftover hop mutt brew.
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