I took a Rollei 35 with me to Philmont (the original style one, made in Germany), backpacking in the New Mexico Sangre de Criste range in the Rockies. At times it sat at the bottom of a 45 lb backpack, and got rained on, beat around etc. The slides I shot with it came out beautiful. The Zeiss Tessar is very sharp, The meter is great, and the focus is accurate because I put a calibrated scale on the back, and use my eyes as a rangefinder.
It's more rugged than it looks, and gives great images, If you can stand the guess-focus/uncalibrated rangefinder. Highly reccomended.