Choose what needs to remain accessible
If the bag is for outings, small items and water may need easy access while you are moving. If it is for overflow, a broad uninterrupted compartment might matter more. Inspect the pocket layout rather than assuming a 20-liter packable design uses either arrangement. The supplied title does not name bottle pockets or internal organization.
Check how it earns space in your luggage
Request the stored measurements and a view of the folding process. A spare bag should fit the space you intend to reserve for it, including any separate storage pouch. Also look up the open dimensions and strap construction. Compact storage alone cannot establish whether the bag is suitable for the weight you expect to carry.
