The welcome bag has become almost a reflex for weddings with many out-of-town guests, but it is easy to overload it with things nobody needs. The goal is not to impress, it is to make the guest's stay a little easier.
What actually has value
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A water bottle and a small snack, especially after a long drive
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The weekend schedule with times and addresses (ceremony, next-day brunch)
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A map or guide to the area if the location is unfamiliar
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A local product (specialty food, small bottle of wine) that fits the destination
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Something for small mishaps: bandages, tissues, earplugs for the party
A realistic budget
Plan roughly 8 to 20 euros per bag depending on contents, for guests actually staying overnight. No need to prepare one for every guest if some are just visiting for the day: target those genuinely staying over.