waist packs/shoulder sling advice?

[RicanFury]

my little brother asked me to buy him a nice shoulder pack/fanny pack/ sling pack whatever the fukk its called for his bday next week. he asked me to get him one that isn't like a duffel bag but not too small. im in my late 30s...i dunno much about this shyt...can someone point me in the right direction? i seen guy's wearing them but that's mostly young guy thing in nyc i dont have friends at my age level to ask so if yall can help dap and rep on deck.

 

[datmass]

https://www.gucci.com/us/en/pr/men/bags-for-men/messengers-crossbody-bags-for-men/ophidia-small-messenger-bag-p-54792696IWT8745

 

[Wildin]

my little brother asked me to buy him a nice shoulder pack/fanny pack/ sling pack whatever the fukk its called for his bday next week. he asked me to get him one that isn't like a duffel bag but not too small. im in my late 30s...i dunno much about this shyt...can someone point me in the right direction? i seen guy's wearing them but that's mostly young guy thing in nyc i dont have friends at my age level to ask so if yall can help dap and rep on deck.

What size gun and how many mags does he carry?