Using cash and USD If you do want to have some Argentine pesos for paying in cash (which you will need for a handful of small shops and restaurants, although most should accept USD in lieu of pesos anyway), you can bring USD (unmarked and untorn hundred-dollar bills)
Great for a mobile approach to moving around the river
Well for easy cleaning mostly
I will switch from the pelican battery box to something lighter, cheaper, smaller, and more convenient, when I find something that satisfies all 4
In essence, the Fastpack 50 fills the niche between ultralight packs made from gossamer-thin fabrics and heavier, more traditional framed trekking packs
The ones to avoid are some no-name reels that come from China , or copies of popular brands