The idea in bundling is to wrap clothes around each other to create a tight package. First, create a “core” by packing your smallest clothing items and toiletries. Next, start creating the actual bundle to wrap around the core by placing the largest items on a flat surface. With collars and tops of pants on the inside, rotate the direction of each new item as if on a square, until you add the smallest item. Finally, place the core bundle in the center and begin folding the bundle around the core, overlapping the pieces used to make the bundle.
Using vacuum seal bags helps remove as much excess air as possible, which can make bundles of clothes quite small. The downside to this method is that clothes can come out fairly wrinkled when unpacking. Place clothes inside a vacuum seal bag, keeping similar sizes and types together in the same bags. Remove all excess air from the bag with the vacuum and seal it shut. This will make envelope-like clothing bundles that fit easily into your suitcase.
Put smaller items inside spaces that otherwise would go unused, such as inside shoes. This is a great space for jewelry, small toiletry items such as contact cases, small bottles, sunglasses and keys. Consider wearing items of clothing and jewelry as you travel, rather than packing them and taking up space. These include bulky items such as heavy jackets, hats, big shoes, scarves and jeans. If traveling by plane, consider using a small bag in addition to your carry-on for stashing very small items and books.
Preparation is a great way to conserve space before you even start packing. Make a list of all essential items you will need on your trip. Keep in mind that shoes are hard to pack and that excess jewelry cases take up space unnecessarily. Decide what items of clothing you will actually need to wear and don't consider unrealistic possibilities, such as a formal dinner on a family vacation. Once you have your list, pack only these items.