

Base Camp Duffel M — worth completing the XS/S/M set?
I currently have a Base Camp XS + two S, with the XS and one S in Golden Tan / Cedar / Honeyed Sand. I loved the color so much that I bought the matching pair.
I’m now tempted to get the M in the same color for €95 (normally €155), but I’m unsure how versatile the M is.
XS: gym + personal item for flights
S: short trips (up to ~5 days by bus/train)
M: potentially longer trips
I’m 165 cm (5' 6)/ 65 kg, and my main concern is whether a fully loaded M becomes too bulky/heavy to comfortably carry as a backpack.
Would you:
Keep XS + 2×S, or
Take the €95 deal and complete the XS + S + M matching set, especially since this color may disappear after the season?
For those who own both: how useful is the M compared with the S in real life?
Thank you very much in advance!