Summer fast approaches, which means it's time to trip.

Whether you're headed across the state or across the sea, it's a cinch you're be trying to cram all of life's necessities (and it seems as if everything is a necessity) into a suitcase.

If this seems to require a magician, perhaps you'll find help by reading a free copy of "Getting a Handle on Luggage," a 23-page booklet that covers the basics, from analyzing your luggage needs to packing your bags.

In addition to the more obvious topics, the booklet lets you in on the basics of luggage insurance and what to do about lost luggage.

The most useful part of all, however, is the collection of diagrams on how to pack a bag.

For a free copy of "Getting a Handle on Luggage," send a long, stamped, self-addressed envelope to Samsonite Traveler Advisory Service, Dept. K-9, P.O. Box 38300, Denver, Colorado 80238.

If your vacation plans include travel across the U.S. border to another country, that means customs.

Customs doesn't have to be a hassle or a problem, if you understand the rules (and comply, of course). The rules come in a rather overwhelming assortment, but to help you along the U.S. Customs Service has put together a very helpful "Travel Pack" containing several brochures.

The most important of these is "Know Before You Go," which summarizes the major rules applying to ordinary travelers. You'll find out what the duty-free limits are, how to make a proper customs declaration, and what the rates of duty are if your purchases exceed the duty-free limit.

By knowing beforehand what the rules are, you can avoid a lot of unplesantness upon your return, and help speed you (and everyone else) through customs. If you've spent all but your last $5 only to face a customs agent asking for $500 in duty, a lot of the fun can go out of your vacation.

Other informative brochures you'll receive are "Information for Travelers -- State Laws on Importing Alcholic Beverages," "Currency Reporting," "Pets, Wildlife," Lmporting a Car" and "International Mail Imports."

For a free set of information, send you request to Travel Pack, U.S. Customs, Washington 20229. CRIME-STOPPERS As crime grows by leaps and bounds, almost everyone wishes that Dick Tracy would appear and solve it all with his handy wrist radio.

Lacking that solution, you might turn to reading "Crime Resistance -- A Way to Protect Your Family Against Crime." It's a publication of no less an authority than the FBI, which says that each of us can do a lot to protect ourselves against crime. This booklet is designed to get everyone started.

You'll find tips on specific things that can be done by anyone to help make home and person less likely to become a crime statistic. There are separate sections on major crime specialities like auto theft, purse-snatching and con games. For a free copy, send a request for "Crime Resistance" to Public Information Office, FBI, Washington 20535. COOL IT One of the miracles of modern life, of so it might seem to those of past generatives is the way we can store and preserve food by cooling.

We've come a long way since the time when food couldn't be preserved at all, and it's not really so long ago that "refrigeration" consisted of a somewhat insulated box and an iceman who made deliveries.

Now most homes have modern refigerators with efficient freezers. Yet a lot of us are a bit slack when it comes to following the rules of preserving with cold. There's a tendency to think that spoilage will be retarded forever just because something gets put in the freezer.

For an excellent summary of how foods should be cold-stored, and a chart showing the time limits for keeping in both refrigerator and freezer, send a long, self-addressed, stamped envelope and a request for "Fridge and Freezer Food-Keeping Facts" to Rubbermaid, Media Dept. FBW, 1147 Akron Road, Wooster, Ohio 44691. FREE FILM We've recently seen an excellent film that would make a worthwile presentation to any group of women.

"Take the Time" is a series of sketches in which women show and tell how and why they've taken up various forms and exercise. You'll see that exercise can vary from running and knee bends to modern dance and racquetball. The important point is that exercise is vital, and getting a reasonable amount needn't be a chore.

If your group has access to a 16-mm projector, you can obtain free use of "Take the Time" by writing West Glen Films, 656 Fifth Avenue, New York 10017. SUN SENSE "Sun Hazards and Sun Sense" is the title of a concise pamphlet that just might keep you from getting badly burned as the summer progresses.

It's those ultraviolet rays that do the damage, and knowing how much you can tolerate and how to turn down the dose will be the difference between those who glow and those who suffer.

For a free copy of "Sun Hazards and Sun Sense," send a self-addressed, stamped envelope to "Sun Hazards," Johnson & Johnson, P.O. Box 836, Somerville, New Jersey 08876. A READER WRITES "I've read a lot about the possible long-term effects the drug DES might have on my children. I have a boy and a girl, and believe I took the drug. Where can I get more information ?"

It once was thought that only daughters of women who took DES were affected, but it appears that sons also may be at greater risk of certain medical problems. You can get a free copy of "You MayBe a DES Son," and/or "You May Be a DES Daughter" by sending a long, self-addressed, stamped envelope to DES Aaction, 1638-B Haight Street, San Francisco, California 94117.