The Promise vs. the Reality
Compression bags and vacuum bags promise to shrink your clothes down to a fraction of their size. The marketing photos show a puffy jacket compressed to the size of a paperback. And honestly, they do work, at least for the first few uses.
The question is whether they are practical for long-term RTW travel, where you are packing and unpacking constantly, often without access to a vacuum, and need to keep your bag organized across months of movement.
Compression Bags vs. Vacuum Bags
Compression Bags (Roll-and-Squeeze)
These are the simpler option. You stuff clothes in, roll the bag to push air out, and seal it. No vacuum needed. They reduce volume by roughly 30 to 50 percent, depending on the material. Brands like Eagle Creek, Sea to Summit, and generic versions all work similarly.
Pros: lightweight, reusable hundreds of times, no tools needed, and they double as organization sacks. Cons: they do not compress as dramatically as vacuum bags, and over time the seals can weaken.
Vacuum Bags (Pump or Valve)
These create a tighter compression by removing more air, either with a hand pump or a one-way valve you sit on. They can reduce volume by 60 to 80 percent. But they are more fragile, harder to reuse quickly, and if the seal breaks mid-trip you are carrying useless plastic.
For RTW travel, compression bags beat vacuum bags almost every time. The convenience tradeoff is not worth the extra compression.
When They Help
Compression bags earn their keep in a few specific situations:
Bulky cold-weather gear. If your route includes both tropical and cold climates, a compression bag can shrink a down jacket or fleece into something manageable.
Organizing by category. Using different compression bags for different clothing types (one for tops, one for bottoms, one for underwear and socks) keeps your pack organized and makes repacking faster.
Dirty laundry separation. A compression bag for dirty clothes keeps them contained, reduces odor spread, and compresses them so they take less space.
When They Do Not Help
If everything in your pack is already lightweight and compact (which it should be), compression bags add marginal benefit. You cannot compress a t-shirt much further than folding it. And if you over-compress, your clothes come out deeply wrinkled, which matters if you are doing anything besides backpacking.
The other issue: compression bags reduce volume but not weight. Your pack weighs the same whether the clothes are compressed or not. If weight is your problem, compression bags are not the answer.
The Practical Approach
Bring two or three lightweight compression bags (the roll-and-squeeze kind). Use them for bulky items and organization. Skip the vacuum bags entirely. And remember that the best packing strategy is bringing less stuff in the first place, not compressing more stuff into the same space.
The Bottom Line
Compression bags are a useful organizing tool that happen to save some space. Vacuum bags are overkill for travel. Bring a few simple compression sacks, use them strategically, and focus your real packing effort on reducing what you bring.