A decade or two ago, people had to search hundreds of places for such invitation kits. However, today they have become a specialized industry employing many creative people. The biggest reason for the popularity of pocket invitation kits is that these invitations are very easy for people to carry around and read. They are also somewhat new to many people and a breath for fresh air ad compared to the older types of invitations.
In the face of these new pocket invitations, the old style invitations with their big white cardboard envelopes seem nothing more than a burden. The smaller invitations are also attention magnets and once opened will almost compel people to respond to it. Also, they give your wedding preparations a cracking start by giving people a glimpse of what they should expect at your wedding.
Since printable pocket wedding invitation kits are so small, you have only so much space to write on as compared to the larger variety of invitations. This may seem like a disadvantage, but is in fact much more of a blessing for you. First of all, it means that you will only print only what is necessary and without any of the accompanying fluff such as big designs and other such stuff.
Since you can't write much in that small space offered by pocket invitations, you are forced to be creative and come up with words that will be good enough to catch people's attention. Lesser words that don't reveal much have a certain surprise element in them. People know that your wedding is going to be fun, but they don't know exactly what fun they are going to have. That intrigue is a big draw for people.
Earlier pocket wedding invitations were small enough that you couldn't write much. Now people have become much more creative created multifold invitations where you can write many more things. The materials used for such invitation kits don't get damaged on folding. Also, they are made such that they look beautiful when opened slowly to read its contents.
These printable pocket wedding invitation kits usually cost less than their larger counterparts because of their small size. However, the more premium and creative invitation kits can cost a lot more because so much work goes into their making. You can choose to buy whichever kits fit your budget.
If you want to add your own touch to the invitations by adding your own content, buy invitation kits in bulk and do your own design on them. Although this may be somewhat time-consuming it is a fair price to pay for something as important as your wedding.