Laundry Bag vs. Pack Liner: Which Keeps Gear Dry?
By Six Moon Designs | Published: 2026-10-29
Category: Comparisons
Compare the Six Moon Designs Laundry Bag and Pack Liner to decide which waterproof roll-top bag best protects your gear on the trail or at the laundromat.
Quick answer
Choose the Pack Liner if your main goal is lightweight, waterproof protection for gear inside your backpack. Pick the Laundry Bag if you want one bag that both keeps your pack's contents dry and doubles as a transport sack for dirty clothes.
Why a roll-top bag matters for dry gear
Both the Laundry Bag and Pack Liner use a roll-top closure and waterproof material with taped seams. That design keeps water out when you close it correctly, whether you are fording a stream or packing wet laundry. The real difference is how each bag fits into your packing system and what else it can do.
Capacity and sizing trade-offs
The Laundry Bag comes in one size: 50 liters. The Pack Liner is offered in both 50-liter and 75-liter sizes. If you carry a larger pack or need extra volume for bulky gear like a winter sleeping bag, the 75-liter Pack Liner gives you that option. The 50-liter versions of both bags have identical dimensions (27" x 21" x 8") and similar weight, so the choice at that size comes down to intended use, not fit.
Trade-offs between the Laundry Bag and Pack Liner
- Primary job: Pack Liner: protect gear inside your pack from rain, splashes, and submersion. Laundry Bag: protect gear inside your pack and also serve as a waterproof bag for dirty or wet clothes off the trail.
- Size flexibility: Pack Liner offers 50 L and 75 L options; Laundry Bag is only 50 L. If your pack is 60 L or larger, the 75 L Pack Liner fits better. Measure your pack's main compartment before choosing a size.
- Weight vs. versatility: Both 50 L versions weigh about the same (Pack Liner: 3 oz / 86 g; Laundry Bag: similar weight). The Laundry Bag adds a second use without a weight penalty, but the Pack Liner saves weight if you never need a laundry bag.
Product facts at a glance
- Laundry Bag: 50-liter roll-top bag made with waterproof material and taped seams; designed to fit inside your pack or transport dirty clothes. You get one bag that serves as both a pack liner and a dedicated laundry sack, reducing the number of items you need to carry.
Laundry Bag - Pack Liner: Available in 50-liter and 75-liter sizes; roll-top closure with waterproof material and taped seams; weight starts at 3 oz (86 g) for the 50-liter version. The extra size option lets you match the liner exactly to your pack volume, and the light weight keeps your base weight low for long-distance trips.
Pack Liner
Which one fits your trip?
Best for
- Thru-hikers and ultralight backpackers who want a simple, lightweight waterproof barrier for their gear and don't need a separate laundry sack.
- Travelers or weekend campers who want one bag that keeps pack contents dry and doubles as a dirty-clothes transport bag.
Not for
- Anyone who needs a dedicated laundry bag only and already has a pack liner — the Laundry Bag works best as a two-in-one solution.
