if you're walking alot, don't choose a pack on weight. Bigger truck carries more loads properly and easier. the best suspension systems for men tend to be the gregory and the osprey aether or atmos. By best, i mean best fit. if you really want to find yoru fit, here's my process.

https://docs.google.com/document/d/1vpEJAlmcOdbIizkDWGBDLNbaNeva8h0hDB1BiayNMVM/edit?usp=sharing