Lightweight backpack for outdoor, Ultralight, only 2.1 pounds for 60L large capacity,reducing the backpack loading weight so that you can carry more other items. The maximum loading bearing is 33lb.
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In terms of kilos, a full 55 litre backpack will weigh around 14kgs approximately whereas a full 70 litre backpack will weigh around 20kg.
I recommend a backpack around 40L-50L. Personally, I wouldn't go over 65L, but some people like a bigger bag. You can always go smaller, but I wouldn't recommend anything smaller than 35L — unless you're into minimalist travel.
The design of the 70L is perfectly suited for airplane carry-on or check in, and the features of the 70L are perfect for any adventure once you arrive at your destination. Being able to compress the 70L allows you to use it as carry-on for all major airlines in the US and Canada.
Trips of 5 days or more usually call for packs of 70 liters or more. These are also usually the preferred choice for winter treks lasting more than 1 night. (Larger packs can more comfortably accommodate extra clothing, a warmer sleeping bag and a 4-season tent, which typically includes extra poles.)
60L Foldable Duffel Bag: This duffel bag size: 23.62 x 12.99 x 11.81 inches, folded size:10.63 x 2.76 x 8.66 inches, only 1.43 lbs, easy to store. 5 separate inside and outside pockets, 1 shoe compartment, 1 back sleeve, 60 liters capacity is enough to meet 3-4 days of travel.
On all flights, except to and from the United States, each passenger can purchase a checked luggage weight allowance of 20 kg, 25 kg, 30 kg, or 40 kg. It doesn't matter how many bags the total weight is split into, but no bag can be over 32 kg (70 lbs) in weight and 319 cm (126 inches) in total dimensions.
For hold luggage, most airlines set a weight limit for single items of luggage. Usually, this is 23kg. If your hold luggage is over and you haven't paid for extra, you might be charged.
70L is definitely too big. I believe the 55L is a 40L + a 15L daypack. This will probably work, but double check the length, width, and height, and make sure none of those dimensions are larger than allowed for a carry on.