I just use a tactical backpack. Does the job of holding my giant 5000 flambeau trays, plastics, spare line, scale, etc. As a bank fisherman, i suggest getting small simple backpack. We're limited to the rods, and baits we can throw. If that isnt an issue then get a full size backpack. I always like to overpack with gear for different situations. It does get heavy limiting movement but I am a pretty strong guy so I dont mind.Bobbing thru trees and brushes, get a small.
Small I used this before going full ham - https://www.amazon.com/REEBOW-GEAR-Tactical-Military-Shoulder/dp/B06Y6949RT/ref=sr_1_3?crid=2OSRE9TH61R4A&keywords=tactical+sling+bag&qid=1554732412&s=sporting-goods&sprefix=tactical+sling%2Csporting%2C147&sr=1-3
If you want a backpack what a lot of guys do is strap the crawler to the outside of the backpack. Maybe even to the bottom. I bought a cheap "military" style backpack that has plenty of places to strap things to. I did a mock up but never actually tried it out. But it would allow you to shift the weight.
This similar to what I have but likely better quality.
https://www.amazon.com/REEBOW-GEAR-Military-Backpacks-Rucksacks/dp/B01KJMK4W2/
I own several Teton packs, including the Grand 5600 /90l Bought it on sale for 115$ and absolutely loved it. Out of stock at the moment, normal price is $150 according to their website. Also own the 4000 /65l pack and it's touch too small for my large frame so my wife uses it, and we both love it.
You use a hikers pack and you definitely won't get any second looks vs some of the tactical looking stuff. I own this tacticool and it's built like shit compared to my Teton's, so it stores gear in my rig for unexpected camping situations.
It has gone up in price since I bought it but it fits your budget exactly.