Will the standard or large size stay upright on a flat surface or will it flop over like regular backpacks?

Thanks for your concern to Piscifun. Yes, it will flop over. If you want a bag that can stand upright on the ground, you can choose it. https://www.amazon.com/Piscifun-Backpack-Capacity-Waterproof-Protective/dp/B07C7R9696/ref=sr_1_7?crid=302BIJ4PP1ZHZ&keywords=BG003&qid=1671099833&s=sporting-goods&sprefix=bg003%2Csporting%2C831&sr=1-7&th=1

why doesn’t the backpack adjust for higher back placement

There are some adjustment buckles on the straps, but the design seems to direct weight into your hips and keep it off your shoulders.

will this hold 2 peice rod?

It would depend on the length. For a 2 piece, I would estimate the maximum length as 6 feet. There are cords and straps on the side pocket, so you can secure around the reel. But any more than 3 feet sticking up seems like asking for trouble.

Model Number	Piscifun-BG016-KH-PN
Color	カーキ
Size	標準
Sport Type	釣り
Batteries Included	No
Target Audience	ユニ, 大人, 女性, 男性
Product Dimensions	24.64 x 11.99 x 33.53 cm; 581 g

Piscifun トラベル X フィッシングタックルバッグ - 防水フィッシングストレージバッグ 男女兼用 多機能アウトドアタックルストレージバックパック 釣り ハイキング サイクリング 旅行用 カーキ

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Piscifun トラベル X フィッシングタックルバッグ - 防水フィッシングストレージバッグ男女兼用多機能アウトドアタックルストレージバックパック釣りハイキングサイクリング旅行用カーキ