How do you handle the excess from the strap? It seems to be made for a 400lbs person. The strap has an mazing excess of strap

Cant answer that since I don't know what a 400lbs man looks like. I don't think a 400lbs man could even fit one around him not alone what to so with the excess. Can you please clarify your question?

What are all the straps on the exterior of the pack for?

There is a strap on the side for a drink holder

can it fit in a small locker?

It's a big bag, will be hard to fit in the small locker.

big enough to use for a middle schooler as a book bag?

It depends on your middle schooler. If he or she is used to carrying around all their text books, pens, papers, notebooks, computer device etc. at all times on their person probably not. Good for a lot of storage with a locker dump during the day tho. Hope this helps.

Display Size	15 Inches
Compatible Devices	Apple iPad Mini
Color Name	blk
Item Shape	Rectangular
Batteries Included	No
Batteries Required	No
Brand	Kawei Knight
Manufacturer	Kawei Knight
Item Model Number	bk1074
Special Features	Laptop Compartment, Water Resistant
Size	2XL
Material	Polyester
Product Dimensions	14.99 x 40.64 x 50.8 cm; 570 g

大型スリングバッグ ノートパソコン バックパック クロスボディ メッセンジャーバッグ ショルダー トラベル リュックサック (A-ブラック)

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大型スリングバッグノートパソコンバックパッククロスボディメッセンジャーバッグショルダートラベルリュックサック (A-ブラック)