"Today there is a second collection for ______. Please put both envelopes in the same basket."

If Second Collections don't have an envelope, envelopes can be put in the pews. Have volunteers sort them.

Having a separate set of envelopes by far makes the most sense. One collection. Sort later.

I wonder why we all don't have one collection? It is so reasonable.

There is no need to have two collections during one Mass. Either have them put both offerings in the same basket or have people collecting at the door as people leave after Mass for the second collection.

I don't understand why it takes so long. Our second collection takes place while the priest is purifying the vessels. It doesn't take any longer than the first collection.

We always have two collections - first for the priests of the diocese, second for the running costs of the diocese, though sometimes that is for a specific thing - the diocesan group that looks after youth, or the poor or marriage and so on.
Then there is often a third collection at the gate, that will be St Vincent DePaul society (for the poor) or some other charity.
Both are done between prayers of the faithful and offertory, while notices are being read out.
Oh, and of course easter and Christmas dues, that comes with envelopes so you can put them into any of the collection baskets. And planned giving envelopes too.
other than that we don't do much fundraising, apart from the golf day, race day at the local racetrack, cake sales, and a few other things.
But we have cut down on the need for collecting money by having no paid music ministry.

A priest I know was once visiting a village in Africa, and upon arriving at the village church on Sunday was informed that the pastor had heard a priest was visiting from the USA, and had sent a message for him to cover the mass in that church for the day. He has the habit of writing a personal reflection on the Sunday gospel even when not writing a homily, so he sent a youth to go to the home he stayed in to find his notebook. In any case, to the point, he said there were three collections during the mass, and one of them consisted not of money, but of food, and much of that was in the form of live animals, everything from chickens in cages to a goat on a tether, all of which were brought up in procession, with much festivity in the form of singing and dancing. He said that in all mass lasted near to three hours. At all of the various processions there was singing and dancing that the entire congregation joined in. His homily, even though it had to be translated by someone as he gave it, was still a bit short by local standards. But then in that area the average journey to the parish was a two hour walk each way in the heat of the African sun, so the longer service was nearly a necessity, as was the communal feasting that followed in the village (which would have been no more lavish than an average Sunday meal in this country).

The moral of the story is, just be glad you only have a second collection, not a third, and that no one feels the need to offer up a goat or chicken, and that the entire congregation doesn't expect to dance around the church several times while the collections are taken.

p.s.
As an alternative form of music for the collection, you can start raising crickets, and place them next to a microphone during the extra collection. If anyone asks you can make some new-agey sounding comment about even the creatures of nature praising the Lord.

The following happened at a friend's non-denom church.

Announcement:
We think we should buy a new building, but we don't think we should go into debt to do it. The cost of the building we have been looking at is $XXX,XXX. We will only buy it if we can raise the entire amount, in cash, next week.
Go home, pray, and if you feel so called --- write a check. Put the check (or cash) inside of a self-addressed stamped envelope. Put that envelope inside another envelope. On the outside of that envelope write the amount of your check, and nothing else (not your name). Then fold it over so no one else can see it.
We will collect all those envelopes. If it is enough, we will open them all, deposit the money, and buy the building. If it is not enough, we will open them and return your check/cash to you.

They collected the money needed for a new building. In one collection.
There was no second collection.