The most common and most likely answer to this crossword clue is the 8 letter word HANDFULS
I've seen this crossword clue in The Daily Telegraph
H
A
N
D
F
U
L
S
Buddy explains!

The straight part
We know that "One can only carry two of these" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one can only carry two of these = handfuls.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does HANDFULS mean?
HANDFULS noun- The amount that a hand will grasp or contain.
- A hand's breadth; four inches.
- A small number, usually approximately five.
- A group or number of things; a bunch.
- Something which can only be managed with difficulty.
- A five-year prison sentence.