I would go & try some different packs on in a shop, & go in with no firm idea of which pack you will buy, find the one that fits you best & don't worry about which gender it was made for, I know lots of shorter slim men who find the women specific packs a better fit.
I personally would look for one with a seperate bottom section that you can put your sleeping bag in & in the case for my vango 65 litre pack, the trangia & quite a few small items. I also like side pockets to put water bottles & those bits you will want during the day in.
I personally prefer to carry my tent inside the pack, in seperate parts, the poles slide down inside the pack as there is a cutout bit in the corner near the back.
I would also look for something that can be easily adjusted in the field & will not move whilst out & about, the back length on my vango can be change by opening a velcro flap & adjusting 2 buckled straps. I have a cheap pack (think it was Aldi) which I use for train travel & the back length took quite a lot of adjusting to get right it has 4 buckles & straps to adjust & doesn't always stay in the correct position.