If it is something you haven't used in the last two years, and it is in good shape you can either sell it, or donate it. "May need someday" means the same as you may never need it. Get rid of it. If you do need one later on, buy or borrow one then. Believe me getting rid of clutter can be freeing.
I have things that I may need someday. They are too nice to throw away. I don't have room for a lot of stuff, like kitchen counters, cupboards, etc. What can I do with them?
Unless they are irreplaceable (and nothing better has been invented), or they are worthy of collection by you for their uniqueness alone, or they have monetary value, donating them is always a good option.
While we are frequently taught growing up that we should appreciate and be good stewards of things that we possess, not all of us know how best to apply that principle.
If you are older and also have older children and / or grandchildren, you might want to ask them if they want any such items. (My aunt cleaned out her closet of things that I considered fascinating and loved to examine when I visited her---I was so upset and she never would have guessed.)
But generally speaking, nothing is irreplaceable and I'm still pretty sure you still can't take it with you.
I understand. I have an icebreaker from about 40 years ago (I had to keep the sealanes open to Murmansk). I have no idea what to do with it now. It takes up most of the yard.
Anyone out there want an icebreaker? (you'll have to collect it).
My solution is "put them in the loft."
However, if this is not an option for you, then it may be a good idea to sell them. If you haven't used these things in say 2 or 3 years, are you ever really going to need or use them?
By the time that you will need whatever it is that you have squirreled away, many things could have changed. Your taste in what you have, the place where you could use it doesn't fit what you have (too big or too small), your girlfriend / boyfriend / spouse thinks it's ugly and won't let you use it, the item has itself deteriorated (rotted, for example) and is no longer useful.
The list goes on. It's nice that you want to save money in the future, however, you really have to be practical. If you're good at finding bargains, when the time comes, you will be able to find what you're looking for, for the right price. My vote - let it go.
Donate them to goodwill .. Salvation Army, pet shelters, womens shelters etc ... If they can't use the items directly they can sell them (for garage sale fund raisers, for example)
You should definitely consider donating the things you're keeping just because "they are too good to throw away". Someone could actually be using those items .... And you would have the benefit of knowing you did something good while making some usable living space for yourself.