Collapsible Portable Liquid Bags: What Size Do You Actually Need? (1.8 vs 5 Gallon)
Comparing 1.8 Gal (7L) and 5 Gal (20L) collapsible liquid bags — capacity, fold-flat storage, and which size fits your portable storage needs. Both in stock now.
8/15/20262 min read
If you've ever strapped a rigid metal container to a boat, ATV, or overland rig, you know the tradeoff: it's bulky, it takes up a fixed amount of space whether it's full or empty, and it's one more hard-edged thing rattling around your cargo area. A collapsible liquid bag solves that — it folds flat when you don't need it and only takes up space when it's actually holding liquid.
We stock two sizes: a 1.8-gallon (7L) bag and a 5-gallon (20L) bag. Here's how to figure out which one actually fits what you're doing.
The 1.8 Gal Bag — for when space is the priority
At under 2 gallons, this bag is built to disappear into your gear rather than dominate it. It fits under a seat, in a side pannier, or in the corner of a trunk without eating into space you need for other equipment.
Good fit for:
ATV and dirt bike riders who want a small backup reserve, not full capacity
Boaters keeping a just-in-case container aboard without giving up deck space
Anyone who wants a compact reserve, not a full tank
The 5 Gal Bag — for real backup capacity
At roughly 5 gallons, this bag is sized to actually matter when you need it — enough to make a real difference for a vehicle, a job site, or an extended trip.
Good fit for:
Overlanding and remote trips where resupply is genuinely far away
Backup storage for job sites or emergency preparedness
Boat owners who want a real reserve, not a token amount
Both sizes share the same core build
Foldable, puncture-resistant material — flat and compact when empty
Durable construction built for repeated fill-and-fold use
No rigid shape to store when you're not using it
Which one should you get?
If you're unsure, think about the actual scenario you're planning for. "I want a compact reserve just in case" points you to the 1.8 Gal. "I need real backup capacity for a trip or job site" points you to the 5 Gal. Some of our customers keep one of each — the 1.8 Gal for daily peace of mind, the 5 Gal for longer trips or bigger jobs.
Both are in stock now and ship the same way — no minimum order, no custom lead time.