What to do with a duplicate gift
Unwrap something you already own and the awkwardness is a different shape from an unwanted gift. You are not deciding whether you like it — you might like it a lot. The only problem is arithmetic: you now have two, and the usual advice about gifts, which assumes the issue is taste, does not quite apply.
Why this is not the same problem as not liking a gift
An unwanted gift asks you to weigh someone's feelings against an object you would not have chosen. A duplicate asks something narrower: which one stays. That is a much smaller decision, and most of the guilt that shows up here is borrowed from the wrong category — imported from the "I can't get rid of a gift" script when the actual situation does not call for it. Nobody gave you a spare on purpose. They gave you a good gift that happened to land on something you already had, which is a coincidence, not a judgment on either the gift or you.
Why gifts duplicate more easily than your own shopping
When you buy something for yourself, you can check first — open a drawer, glance at a shelf, ask yourself whether you already have one. A person buying you a gift has none of that access. They are working from memory of what they have seen you use, or a guess at what you would like, with no way to look inside your closet before they commit. Add a birthday with several givers who do not know about each other, or a popular item that shows up on more than one person's list of good ideas that year, and a duplicate is not a sign anyone did anything wrong. It is what happens when several people are all guessing well, independently, about the same person.
What actually decides what happens next
Three situations call for different handling, and mixing them up is what makes this feel harder than it is.
Store-bought, with a receipt or gift tag. The simple case. Most shops will exchange or refund it, and doing so is not an insult to the giver — it is the ordinary, anonymous end of a transaction they never see. Nobody's feelings are on the other end of a return desk.
Handmade, or a specific item chosen with visible care. This deserves different handling, the same way it would if you simply didn't want it. The gesture is not really about the object matching a gap in your shelves — it is about someone's attention. Keep this one and treat the older, worn one as the spare, or pass the older one along, rather than returning the one someone put thought into.
From someone who is likely to ask about it, or see it in use. Worth a moment's thought before you act, covered next. Everything else — an item from someone you see rarely, or one where nobody is likely to notice which version ends up on the shelf — can go without much deliberation at all.
Do you say something
Telling a giver you already have one is often more welcome here than it would be for an unwanted gift, because it is useful information rather than a judgment — it helps them not repeat it next year, and most people would genuinely rather know. Said plainly and without apology, "I actually already have one of these, so I'm going to exchange it for a size up," lands as ordinary practical news, not as a rejection. The exception is a gift that was clearly handmade or chosen with real effort, where the fact that it duplicates something is beside the point of why they gave it — there, the mismatch is not worth mentioning at all, because it was never really about filling a gap in what you own.
Which one you actually keep
Not always the new one, and not always the old one out of loyalty to whichever came first. The plain question is which one is in better condition and which one you would keep if you had to buy just one today. A worn original next to a fresh replacement is usually an easy call in the new one's favor; a barely-used original next to a duplicate you will never open is the opposite. Sentiment can outrank condition — a mug from a parent beats a nicer one from a colleague regardless of wear — but it should be a deliberate choice, not a default you fall into because deciding felt like more effort than keeping both.
Where the other one goes
If it has a receipt or tag, returning or exchanging it is the cleanest outcome and does not require anyone to find out. If it does not, regifting works the same way it does for any unwanted gift — into a different circle, not back into the group that would recognize it. Donation is the calm default when neither of those fits: it needs no explanation, and the object gets used, which was the point of giving it in the first place.
The part worth doing before it leaves
Log the one you are keeping, if you keep anything like an inventory at all — not out of formality, but because the entire reason this happened is that nobody, including you, had an easy way to check what you already owned. Kept's "check before you shop" search exists for the version of this problem you cause yourself; the same habit, applied once when a duplicate gift arrives, means the next spare candle or water bottle someone buys you with love is at least one you can spot and redirect quickly, instead of relearning the same arithmetic from scratch.
What "done" looks like
Not a rule about never accepting anything you might already own, and not an audit of every gift before you say thank you. It looks like one kept, in better shape or with more meaning attached, one returned or passed on without ceremony, and a thank-you that was genuine the moment it was said and does not need to be reconsidered later.