Party favors are the least of peoples priorities when they are organizing a party these days. After all, one usually will only have a budget for the food and the entertainment and nothing left for other expenses. But those who do find a small piece of the pie chart and dedicate it to party favors muck up the whole process of giving party favors that it would have been better if they didnt give any. For me, it is better to give nothing than to give the wrong thing.
One of the most basic things that you should remember when choosing and buying a party favor kit is the purpose of giving it. It is a souvenir that will hopefully make the person remember your party and your event. Remember this when thinking of party favor ideas. Most people think that it is enough to just give a small token of a useless thing just as long as it has their names, the date and indicates what the occasion is. They dont realize that for their guests to actually remember them through the party favor that they gave, it should be something that they can use, preferably every day. The party favor should not only be beautiful, it should also be functional.
Another mistake that people do when giving party favors is to just give it with no information on it about the party or the celebration or to give it with the information engraved on it. The latter is actually done often and has actually been a practice in most cultures. Doing both is wrong because not giving any information about you or what your party is about defeats the purpose of giving the swag bag in the first place and giving too much information and actually putting them on the souvenir item is in bad taste.
What you should do is to put information on a separate small piece of paper and attach them on the gift. That way, they will have a reminder of where they got it, who gave it to them and what the event was. The gift itself should not have any trace of identification whatsoever. If they want to display the gift with the tag and keep it along with the rest of their souvenirs, they can choose to. The key here is the freedom to choose what they can do with the gift. If your guests want to use their gifts without having to explain every time about the inscriptions on it, it is their decision.
It is also much better to give one big gift than to fill the swag bag with small useless items that seem cheap and tawdry. This is not only very time-consuming to prepare but also costly when you really add up the total. Why not buy something that will cost around the same amount when you combined your small gifts? Giving one big gift will also make your party favor more expensive than it really is.